Hello TheMaxter,
I’m working with a fresh-install of windows, so I just got this very same problem.
I first tried to install Visual Studio 2019 (no luck) Then used the Visual Studio Installer ‘Modify’ function to install .NET Core 3.1 Runtime (no luck)
Then I installed .NET from Microsoft.
At that point opening up a command prompt and typing ‘dotnet’ worked, but I needed to restart my PC before I was able to zip projects. Cheers.