Once you have downloaded the file, follow these steps to install it properly. Method 1: Using PowerShell (Recommended)
Delivers updated UI controls, styles, and behaviors that adhere to the Fluent Design System.
Type Add-AppxPackage -Path and then drag and drop the downloaded .appx file directly into the PowerShell window to auto-populate the exact file path. The final command will look similar to this: powershell
Microsoft.UI.Xaml.2.8_8.2310.30001.0_x64__8wekyb3d8bbwe.Appx microsoft.ui.xaml.2.8 appx download
You need to test your application against a specific framework version.
Many system administrators and developers host necessary framework files on GitHub. You can search for Microsoft.UI.Xaml.2.8_8.2310.30001.0_x64__8wekyb3d8bbwe.Appx on GitHub to find pre-extracted packages, such as in various "LTSC-Add-MicrosoftStore" projects. How to Install Microsoft.UI.Xaml.2.8 Appx
The framework (part of the Windows UI Library or WinUI 2 ) is a vital dependency for many modern Windows applications, including Windows Terminal and the Microsoft Store . If you encounter errors like 0x80073CF3 (missing framework dependency), you may need to download and install the .appx package manually. Official Download Methods Once you have downloaded the file, follow these
If you already have the AppX file or want to force Windows to register it, PowerShell is the most reliable tool. Open the folder where you downloaded the file.
Microsoft maintains the WinUI project on GitHub. While the primary distribution is via NuGet, release notes often link to direct artifacts.
Download the specific architecture you need, such as Microsoft.UI.Xaml.2.8.x64.appx . 2. Manual Extraction from NuGet The final command will look similar to this:
Open your web browser and navigate to the trusted third-party portal: (specifically the Online Link Generator for Microsoft Store).
If you are seeing an error message like “This app needs Microsoft.UI.Xaml.2.8” , or you are an IT administrator deploying LOB (Line of Business) applications, downloading the correct or .appxbundle file is essential.
If your default App Installer program is broken, use PowerShell to force-feed the package to the operating system: Open .