Type Add-AppxPackage -Path and drag the downloaded APPX file directly into the PowerShell window to auto-populate the path. The command will look like this: powershell
Note: If your browser blocks the download because it is an HTTP link, click "Keep" or "Allow download" in your browser's download manager, as these files originate directly from official Microsoft distribution networks. Method 2: Download and Install via Windows PowerShell microsoft.ui.xaml.2.8 appx download
In the search box, paste the following official package string: Microsoft.UI.Xaml.2.8_8wekyb3d8bbwe Click the checkmark button to generate the download list. Step 2: Choose the Correct Architecture Type Add-AppxPackage -Path and drag the downloaded APPX
| Error Message | Likely Cause | Solution | |---------------|--------------|----------| | “The app package is not valid” | Corrupted download | Re-download from official source. | | “A higher version is already installed” | System has WinUI 2.9 or later | No action needed; backward compatibility is typical. | | “0x80073CF3” | Dependency missing (e.g., VC++ runtime) | Install missing prerequisites. | | “Certificate not trusted” | Unsigned or modified .appx | Ensure file is from Microsoft. | | “Package could not be registered” | Permission issue | Run PowerShell as Admin. | Step 2: Choose the Correct Architecture | Error
(Note: This works if the files exist in your system repository but are unregistered).
A list of direct download links from Microsoft's servers ( *.microsoft.com ) will populate below.