support for asp.net 1.1 stopped at windows 8
https://learn.microsoft.com/en-us/dotnet/framework/install/run-net-framework-1-1-apps
you should probably use windows 2008 r2 as your dev box (perhaps run in a VM). then follow:
https://blog.softartisans.com/2010/07/01/running-asp-net-1-1-on-windows-server-2008-r2/