Around the beginning of 2024, Microsoft replaced the "Classic" Q# quantum development kit with a new "Modern" QDK. Code written for the classic version can no longer can be run with the modern version.
I’d like to be able to run the code from this paper on windowed arithmetic that was written for the classic QDK. Is there any way to get the old QDK working?
The changes between the classical QDK and modern QDK are mostly in the backend (it reimplemented a new compiler and runtime that is a lot leaner and do not dependend on .Net core), but Q# itself didn't change much. You should be able to run the code in that paper without too many changes.
That being said, after installing the old .net core 2.1, you should be able to compile and run the tests in this paper using dotnet test.
