The source code for the version of WinUI 3 in WinAppSDK 1.8.7 is available. 1.8.7 is a stable servicing release for the WinAppSDK
that includes bug fixes and reliability improvements for 1.8, plus two additive Windows AI APIs and an updated ONNX Runtime.

Check out our release notes for the list of fixes and changes in this release.

Download the WinUI NuGet package for 1.8.7 here: https://www.nuget.org/packages/Microsoft.WindowsAppSDK.WinUI/1.8.260415005