A dialogue box popped up, asking for permission to install an untrusted package. The security shield icon glared at him. He clicked Yes .
Get-AppxPackage -Name Microsoft.UI.Xaml.2.8 microsoft.ui.xaml.2.8 appx download
If you are missing this dependency (often indicated by error 0x80073CF3 ), you can install it using PowerShell with Administrator privileges: Open as an Administrator. A dialogue box popped up, asking for permission
His app relied on WinUI 3, the latest flourish in Microsoft’s user interface toolkit. It needed the specific Visual C++ Runtime components packaged within Microsoft.UI.Xaml.2.8 . Usually, the Store handled these dependencies automatically, invisible and silent. But Elias was side-loading a private build for a high-profile client meeting in the morning, and the environment on the test machine was sterile. It didn't have the baggage of previous updates. It was a blank slate, and it was rejecting his masterpiece. Get-AppxPackage -Name Microsoft