To free up some disk space on C: I've decided to remove completely the conten of the folder C:\ProgramData\Microsoft\VisualStudio\Packages. After doing that, I'm not more able to update to the actual release of VS2017 Community. I'm working with 15.6.1.
Using Help-> Check for Updates does not solve the problem. I've got a window popping up telling me that my current version (15.0.0.0) is up to date!
Any idea/workaround how to solve it?