I have Pro Basic since 2015. I have been using it on one PC. I wanted to use on another PC and I see I don’t have any more activations. I assumed that maybe I had an older version that only allowed 1 activation and had no problem buying the 10 pound version. When I did, it says that I already have that version. So my question is: how can I deactivate versions that I have long since forgotten OR since I don’t remember installing 2 other versions - maybe there is a glitch!?