I've got Windows 10 Pro 64 bit, Microsoft Visual Studio 2015 and the full Windows 10 SDK package but I'm not able to find gacutil.exe in:
Don't come tell me it's a duplicate, please. The other answers don't actually answer my question.
Any idea? Thanks in advance!
I had to use the Microsoft Visual Studio 2015 Developer Command Prompt.
Unfortunately, Microsoft KB's are outdated and they usually give the wrong answers.
Go to Start -> Visual Studio 2015 -> Developer Command Prompt for VS2015