I downloaded vvvv, but it doesn't open and i can see these errors with Event Viewer

[StiX]

OK, I found the problem

so in your system path variable, there are two pointing to dotnet
They need to be in correct order:
…;C:\Program Files\dotnet;C:\Program Files (x86)\dotnet;…

If the (x86) is before x64 - dotnet SDK wont work