1. C# Launch Url
2. Launch App Via Url Mac Catalina Island
3. Launch App Via Url Mac Catalina Version

The Twitter app on MacOS Catalina. Apple Users of the Post-it app had requested a desktop version, and Catalyst was a relatively easy way to make that happen, said Remi Kent, global brand director.

• MacOS Catalina (version 10.15) is the sixteenth and, as of July 2020, current major release of macOS, Apple Inc.' S desktop operating system for Macintosh computers. It is the successor to macOS Mojave and precedes macOS Big Sur, which is planned to be released in the second half of 2020.It was announced at WWDC 2019 on June 3, 2019, and was released to the public on October 7, 2019.
• Oct 12, 2019  Apple’s latest Mac update, macOS Catalina, was released earlier this week, and with it came a flurry of complications both minor and major. For one, this update is the first for Apple to drop 32.
• Oct 09, 2019  Launch System Preferences on your Mac. Click on Apple ID at the very top. And that's it, you now know how to use Apple's newest and finest app for macOS Catalina.
• Oct 08, 2019  With another new macOS Catalina feature, Sidecar, you can use an Apple Pencil to draw on the app using an iPad as a second screen. Any changes on the Mac.

Launch Services is a core service of the Mac OS that enables an actively running application to open other apps, documents, or URLs (Uniform Resource Locators). Launch Services is also used to prioritize which app is used to open a document or URL.

Launch Services replaced a number of earlier system managers the Mac used to use, such as the Desktop Manager, Internet Config, and File Manager, replacing them with the single Launch Services system, and the database Launch Services maintains to keep track of all things related to how documents and apps relate to each other.

Launch Services allows an app or document to:

• Open (launch or activate) another app.
• Open a document or URL.
• Identify the preferred app to use to open a document or URL.
• Register the type of documents or URLs an app is capable of working with.
• Keep track of information needed for displaying a file or URL, including its icon, name, and kind (examples: JPEG, PDF, Folder, Volume).

In past versions of the Mac OS, this type of information was maintained by the Finder, as well as by some specific system managers. By consolidating this information to the Launch Services, it allows for greater reliability, easier (actually, automatic) registration of file and document associations, and less need to repair file association information. If you remember having to rebuild the Desktop frequently on older Macs, then you know the file associations tended to get out of whack often.

Launch Services maintains a database aptly known as the Launch Services Database, which is used to record all the needed information about apps, documents, and URLs to determine which items an app is capable of working with.

Application Registration
Launch Services automatically registers an app with the database the first time the app becomes known to the system. This can occur when:

• The Finder reports an app has been added to the Applications folder.
• An app installer is run.
• When a document is opened that has no preferred app, the user is asked to select an app to use, and that app is registered with Launch Services.
• When the built-in Launch Services tool is run whenever you boot your Mac or login as a user. This tool scans the Applications folder looking for any new apps that have been placed there.

Opening Documents
When you open a document or URL, Launch Services is used to determine which app to use to open the item. Launch Services uses the following specific order to check for which app to use:

User-Specified Binding: If the user has set a specific binding by manually setting a file association, then use that app to open the document or URL. Do not check further. Note: You can manually set file associations using one of the tips in: Quick Tip: Managing macOS File Associations or macOS 101: Six “Forgotten” Tips for New (and Old) Mac Users.

If the document has a file name extension, Launch Services will find all apps that list the extension as compatible.

If the document has a four-character file type, Launch Services finds all apps that accept the file type.

If more than one app is found, the following is used to determine a preference:

If the document has a four-character creator type that matches an app:

Give preference to apps on the boot volume.

Give preferences to apps residing on local volumes vs. ones on remote volumes.

If two or more files and an app still meet the criteria, give preference to the newest version.

What Could Go Wrong?
For the most part, Launch Services and its database provide a robust and reliable service for managing app and document associations. But as we all know, sometimes things can go wrong. Some of the most common problems encountered include:

• Wrong document icon: The most common form this problem takes is a document file having a generic icon when it should have an icon associated with the app that was used to create it. Other possible icon issues include a document having an icon from another app, and not the one you used to create it.
• Recent Items menu or Recent Items Dock stacks being incorrect: The Recent Items listing isn’t showing the correct app or doc, or isn’t being updated when you open an app or doc.
• Open With menu: If the Finder’s File, Open With menu or the contextual (right-click a file icon) Open With menu is displaying duplicate entries, or one or more apps are being listed that should not be used to open the document type.
• Wrong app associated with a document: This is similar to the Open With problem listed above, but in this case, the problem occurs because an app you used to use has been removed from your Mac, and the Launch Services database, for an unknown reason, wasn’t correctly updated.

C# Launch Url

Rebuilding Launch Services Database
Any of the above issues can usually be fixed by rebuilding the Launch Services database. You’ll find instructions for two different methods of rebuilding the database in the Rocket Yard guide: Quick Tip: Managing macOS File Associations.

If you’re running into an issue where an app continues to show up as either the default or a recommended app in the Open With menu, but the app isn’t one that should be used to open the document type, or is one you don’t wish to ever use, you can manually remove that app’s association with the document and prevent it from ever appearing in the Open With list again.

Remove a Single App from the Open With Menu
The technique to remove a single app from the Open With list requires you to edit the app’s Info.plist file and rebuild the Launch Services Database. Essentially, you’re removing a file extension type that the app in question knows how to work with. By eliminating the extension type from the app’s Info.plist, you make the app blind to the removed file type.

One common reason for doing this is to prevent an app from opening to edit or view a specific file type. For instance, you may normally use Photoshop to work with most graphics file types, but you prefer a different app for viewing PDF files.

Normally, you would use the option to create a User-Specified binding, as outlined above, to make sure those PDF image files are opened in your preferred app. But creating a User-Specified binding won’t keep the original app from being included in the Open With menu. If an app showing up in the Open With menu is really an issue for you, you can remove it using the following technique.

Before you attempt this method, make sure you have a current backup. You’re going to be making changes to an app, changes that can affect how the app in question works. If something should go wrong, you’ll want to be able to restore the app from a backup.

Using the Finder, browse to the app you wish to keep out of the Open With menu.

Right-click the app, and select Show Package Contents.

Open the Contents folder.

Right-click the Info.plist file, and select Duplicate from the popup menu.

This will create a file named Info copy.plist. This copy contains the data from the original Info.plist file. You can use this file to restore the Info.plist file to its original state should you ever need to. This step is just a precaution.

Right-click the Info.plist file, and select Open With from the popup menu.

You can open the Info.plist file with just about any text editor, including TextEdit, but I recommend using a text editor such as BBEdit, which knows how to format property list files for easier readability.

The context menu for Trash will display. Why isnt my trash app on mac emptying. Then, you need to press and hold the Option key. Here select Empty Trash from the context menu for Trash.

Using the text editor’s search function, locate the CFBundleTypeExtensions key.

There can be multiple CFBundleTypeExtensions keys in the Info.plist file; look for the one that incudes the following entry, just after the CFBundleTypeExtension key: <string>pdf</string>.

Once you locate the extension suffix you wish to remove, use the text editor to delete the entire line that says: <string>pdf</string> (in this example).

Save the edited Info.plist file.

Use the linked instructions, above, to rebuild the Launch Services database.

Rebuilding Launch Services on Older Versions of the Mac OS
Launch Services has undergone a few changes over the years since it was first made available. If you’re using an older version of OS X, you may have seen error messages when you tried to rebuild the Launch Services database. Here are the instructions to perform a rebuild for earlier versions of OS X:

OS X Jaguar (10.2)
Quit all apps.

Delete the com.apple.LaunchServices.plist file located at ~/Library/Preferences.

Delete the com.apple.LaunchServices.UserCache.csstore file located at ~/Library/Caches.

Restart your Mac.

OS X Panther (10.3)
Follow the instructions for OS X Jaguar and include the following item in the list of files to be deleted:

com.apple.LaunchServices.6B.csstore located at /Library/Cache.

OS X Tiger (10.4)
Follow the instructions for OS X Jaguar, and include the following items in the list of files to be deleted:

com.apple.LaunchServices-0140.csstore

com.apple.LaunchServices-014xxx.csstore. The xxx is a stand in for a UID (User ID) number that is unique to you.

The above files are located at /Library/Cache.

OS X Leopard (10.5) and Snow Leopard (10.6)
Use the following Terminal command in place of the one mentioned in the linked article under the Rebuilding Launch Services Database section, above:

find /System/Library/Frameworks -type f -name “lsregister” -exec {} -kill -seed -r ;

OS X Lion (10.7) and later
Use the Terminal command as directed in the linked article.

If you run into any problems we haven’t covered, or discover a new tip, please share the info in the comments section, below.

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Apple’s system updates have greatly improved over time. And though you’re less likely to face issues (slow downloading speeds, unable to resume download, frequent disconnections, etc.) while downloading macOS Catalina this year, there’s no guarantee that they won’t happen at all.

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Many users would still be looking for direct downloads for macOS Catalina, primarily for multi-threaded, faster downloading via download managers & accelerators, resume support for incomplete/interrupted downloads and many more reasons.

In this article, we’ll explore a way to download macOS Catalina directly from the Apple server instead of via the MAS, using your favorite web browser or a download accelerator.

Note: This post is specific to macOS Catalina direct download from Apple servers. For other macOS and OS X releases, check our earlier articles in this series.

Page Contents

• 1 Download and install macOS Catalina without MAS / System Preferences

Download and install macOS Catalina without MAS / System Preferences

Since macOS Catalina, OS updates are delivered through the Software Update menu in System Preferences. When you try to download macOS updates via MAS, you’re automatically redirected to the Software Update menu.

In macOS, when you click on the Update button, some package files are downloaded to your computer, and then processed by the Software Update utility, to convert them into an executable “.app” file. You cannot install macOS directly from the raw package files.

For this workaround, we’re going to directly download these raw packages from Apple server using a web browser or a suitable download accelerator. Then, we’ll configure the computer in such a way that Software Update processes the package files by fetching them from a local directory on your Mac, instead of downloading it again from the Apple Server.

Launch App Via Url Mac Catalina Island

macOS Catalina Direct Download

Step 1: Download the three “.pkg” files from the respective URLs given below.

macOS Catalina 10.15.5 (19F101) / June 1, 2020 (Updated)

1. macOS Catalina InstallESDDmg.pkg file download URL: http://swcdn.apple.com/content/downloads/49/02/001-12336-A_QLFL0RTBKY/g7p7womx20182etq6bvffbwe4a41grcxod/InstallESDDmg.pkg
2. macOS Catalina RecoveryHDMetaDmg.pkg file download URL: http://swcdn.apple.com/content/downloads/49/02/001-12336-A_QLFL0RTBKY/g7p7womx20182etq6bvffbwe4a41grcxod/RecoveryHDMetaDmg.pkg
3. macOS Catalina InstallAssistantAuto.pkg file download URL: http://swcdn.apple.com/content/downloads/49/02/001-12336-A_QLFL0RTBKY/g7p7womx20182etq6bvffbwe4a41grcxod/InstallAssistantAuto.pkg

Step 2: Configure your Mac so that Software Update looks for the macOS packages locally instead of from the Apple server.

To do this, you need to edit the hosts file on Mac to point the root domain of the download URLs (“swcdn.apple.com”) to localhost (“127.0.0.1”). The below instructions will guide you to modify the hosts file as required.

1. Launch Terminal on your Mac from Launchpad or Applications list.
2. Type in the following command: “sudo nano /etc/hosts”
3. Provide the System Password when prompted. The hosts file is now open in editable mode within the Terminal window.
4. Append the following line to the end of the file: “127.0.0.1 swcdn.apple.com”.
5. Press control + X (^X), then Y and hit return to save the file and return to Terminal prompt.

From now on, any request issued for the particular root domain (swcdn.apple.com) from the Mac will be directed to localhost.

Note: Sometimes, you might need to flush the DNS cache for the changes to take effect. In that case, use the “sudo killall -HUP mDNSResponder” command to flush DNS cache.

Step 3: Place the package files in a certain relative path from the localhost root, to mimic the structure of their respective download URLs.

In this example, we’ll create a folder named “macos_local” on Desktop, and replicate the directory structure of the package URLs under the same. Once the relative path has been created, we’ll configure the localhost server to point to the “macos_local” directory on Desktop. Then, we’ll use macOS’ built-in SimpleHTTP server to convert the folder into a web server directory.

Launch App Via Url Mac Catalina Version

The below instructions will guide you through the setup process.

1. Open Terminal from the Launchpad or Applications list.
2. Type “cd Desktop” on the command line and hit return to enter the Desktop folder.
3. Type “mkdir macos_local” and hit return to create the root directory of the same name on Desktop.
4. Go to the newly created folder by typing “cd macos_local” and hitting return.
5. Enter the following command to create the relative path for the .pkg files, inside the macos_local folder (Provide the admin password when requested):
   “sudo mkdir -p ./content/downloads/49/02/001-12336-A_QLFL0RTBKY/g7p7womx20182etq6bvffbwe4a41grcxod/”
6. Place the downloaded package files in their respective relative location (as per their URLs) within the macos_local folder on the Desktop. Click on Authenticate when prompted, and provide the system admin password.
7. With macos_local as the present working directory in Terminal, execute the following command: “sudo python -m SimpleHTTPServer 80”. Provide the admin password and click on Allow in the subsequent message prompt.

The current directory (macos_local) is now hosted on localhost. Leave the Terminal window open to keep the localhost server running until the process is completed.

To verify the setup, click on any of the package (.pkg or pkg) URLs in your browser and check the download speed as it downloads the package.

You may notice a very high-speed download (which is much higher than the speed of your Internet connection). This is because the file will be downloaded through localhost; your Internet bandwidth won’t be used.

Step 4: Download macOS Catalina through the Mac App Store or System Preferences.

Don’t worry. Since you’ve redirected the package URLs locally, Software Update / MAS will fetch the package files from localhost and launch the installer (“.app”) file once the packages have been processed.

Note: Your Mac might request additional resources from the “swcdn.apple.com” domain while installing macOS Catalina. Thus, it is recommended to remove the entry from the hosts file that we appended earlier, before proceeding with the installation.

Is the workaround genuine?

In this workaround, we are downloading the required resources from the Apple Server and using the official Software Update channel to install the OS update. So yes, it is as genuine as the official method.

The only factor we’re changing here is the location where Software Update / MAS fetches the packages from. If you are downloading the macOS package files from third-party sources, you can verify whether it’s the original, by comparing their MD5 and SHA1 hash values.

macOS Catalina Bootable Installer (macOS Catalina DMG)

Now that you have the “macOS Catalina.app” installer, you can upgrade multiple Macs to the latest version using the same file. However, if you are looking to perform a fresh installation, you need to create a bootable installer for Catalina.

The bootable image for Catalina (InstallESD.dmg) is located within its “.app” file. To get the InstallESD.dmg file, right-click on “macOS Catalina.app”, select “Show Package Contents” option, and browse to the “Contents/SharedSupport/” folder.

Alternatively, the bootable installer for macOS Catalina may be directly created from the “.app” file using the “createinstallmedia” command, as suggested by Apple.

If this workaround has helped you to get macOS Catalina easily or saved your Internet bandwidth on single or multiple installations, let us know in the comments below.