There is no "standard" namespace or class called "VisualStudioInstallation" so either you have mistyped it, or produced it yourself. If the latter, have you forgotten to add an assembly reference to each project that needs to access it (
Adding Assembly References in Microsoft Visual Studio - TestStand 2019 Help - National Instruments[
^]) and a
using
line to each file in the project to make the access simpler?
If you got your code from somewhere, then you have either not followed the "get it working" instructions or the author didn't provide any. The latter implies he knows about as much as you do: find something else! :laugh:
To be honest, if you are a complete beginner - and your question would imply that - I'd strongly suggest that you leave Unity and games out of the equation for a while, and become good and familiar with C# (or VB, if you must) and Visual Studio first. There is a lot to learn in that allone, before you start branching out into the massiveness of confusion that is Unity as well!