Hello @Mark Sandfox ,
Welcome to Microsoft Q&A forum.
Please get the GDK from here: GDK - Releases(scroll down, expand the Assets
and download the Source code).
Follow the instructions here: Microsoft Game Development Kit (GDK) -General Info (Updated June 2021) to install it.
Install. Run PGDK.EXE to launch the install wizard. If you have a previous version of the GDK you may need to uninstall that first.
Besides, please kindly check documentations to set up your developer environment before you try to install GDK.
Best Regards,
Tianyu
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