Fix Minecraft Launcher Not Installing Error (0xUnknownAppInstall) We Weren't Able To Install The App

If you're encountering the "Minecraft Launcher Not Installing Error (0xUnknownAppInstall) We Weren't Able To Install The App" issue, you can try the following step-by-step solutions to resolve the problem:

Solution 1: Update Windows and Drivers

• Ensure that your Windows operating system is up to date. Go to "Settings" > "Update & Security" > "Windows Update" and click on "Check for updates."
• Install any pending updates and restart your computer.
• Update your graphics card drivers to the latest version. Visit the manufacturer's website for your graphics card (e.g., NVIDIA, AMD, Intel) and download the latest driver for your specific model. Follow the installation instructions provided by the manufacturer.

Solution 2: Run the Launcher as Administrator

• Right-click on the Minecraft Launcher shortcut/icon and select "Run as administrator." This will give the launcher elevated privileges, which might help with the installation process.

Solution 3: Clear Minecraft Launcher Cache

• Press the "Win + R" keys on your keyboard to open the Run dialog box.
• Type %appdata% and press Enter. This will open the Roaming folder.
• Locate the ".minecraft" folder and open it.
• Delete the "launcher_profiles.json" file. This file stores your launcher profiles but deleting it won't affect your installed games.
• Close the File Explorer window and relaunch the Minecraft Launcher to see if the issue is resolved.

Solution 4: Disable Antivirus/Firewall Temporarily

• Temporarily disable your antivirus software and firewall.

Note: Exercise caution when disabling security software and make sure you re-enable it once you've completed the troubleshooting process.

• Attempt to install the Minecraft Launcher again and check if the error persists.

Solution 5: Use Microsoft Store Version (if available)

• Open the Microsoft Store on your Windows computer.
• Search for "Minecraft" and select the official Minecraft app from the search results.
• Click on the "Install" or "Get" button to download and install the Minecraft Launcher from the Microsoft Store.

Note: This solution is only applicable if you have the Microsoft Store version of Minecraft available.

Solution 6: Clear Temporary Files

• Press the "Win + R" keys on your keyboard to open the Run dialog box.
• Type %temp% and press Enter. This will open the temporary files folder.
• Select all the files and folders in the temporary files folder and delete them.

Note: Some files may not be deleted as they are in use by running programs. Skip those files and delete the rest.

• Restart your computer and try installing the Minecraft Launcher again.

Solution 7: Check Disk Space

• Ensure that you have enough disk space available on the drive where Minecraft Launcher is being installed.
• Open File Explorer and check the available disk space on the drive. If the drive is running low on space, try freeing up some space by deleting unnecessary files or uninstalling unused applications.
• Once you have freed up space, attempt to install the Minecraft Launcher again.

Solution 8: Repair Minecraft Launcher

• Press the "Win + R" keys on your keyboard to open the Run dialog box.
• Type "appwiz.cpl" and press Enter. This will open the Programs and Features window.
• Locate Minecraft Launcher in the list of installed programs, right-click on it, and select "Repair" or "Modify" (the wording may vary).
• Follow the on-screen instructions to repair the Minecraft Launcher installation.
• Restart your computer and check if the error is resolved.

Solution 9: Reinstall Minecraft Launcher

• Uninstall the Minecraft Launcher from your computer. You can do this by going to the Programs and Features window (accessed through the "appwiz.cpl" command in Solution 8), locating Minecraft Launcher, right-clicking on it, and selecting "Uninstall."
• Download the latest version of the Minecraft Launcher from the official Minecraft website or the Microsoft Store (if applicable).
• Install the Minecraft Launcher using the downloaded installer file.
• Launch the Minecraft Launcher and check if the installation error is resolved.

If none of the above solutions resolve the issue, it's recommended to reach out to Minecraft support or the Minecraft community for further assistance. They may have additional troubleshooting steps or insights specific to the error you're encountering.