Unable to build due to .NET version issues

[sf0x]

Hi,
I tried to build the application for a few hours now but failed all the time.
I downloaded the the prerequisites as described, .NET3.5, VS 2022 with the .net dev and build tools installed and donut.core.
The issue is, when I open the project file, it claims all the time, that donut.core was build with .net core 2.1 and requires this. But as soon as I set the project to use .net 2.1, vs error that netcoreapp2.1 is incompatible with system.runtime.compilerserver.unsafe.
Severity Code Description Project File Line Suppression State
Error System.Runtime.CompilerServices.Unsafe doesn't support netcoreapp2.1. Consider updating your TargetFramework to netcoreapp3.1 or later. OffensivePipeline C:\Users\user\.nuget\packages\system.runtime.compilerservices.unsafe\6.0.0\buildTransitive\netcoreapp2.0\System.Runtime.CompilerServices.Unsafe.targets 4
If I suppress this error via true, no more nuget included packages are working anymore.

Do you have any idea how to resolve this and get this to build?

Cheers
sf0x