Hi @rtlgroen – thanks for your question. I think @rovinggecko is on the right track here.
Right now, Roon installs on Windows are per user meaning each Windows user can have their own install of Roon, but right now, they can’t be shared by multiple users of the same PC. There are a number of reasons we install this way, and @danny discussed them (and the possibility of changing this in the future) here.
This is not necessarily why you’re having issues here (and here), but it seems likely. We install in a way that guarantees the user has full control of the install directory, so admin privileges should only come into play if you’re trying to run as a different user than when you installed.
Let me know if any of this rings a bell, and if not, we can look further. Thanks!