Hi. I used to have a quite old version of Parallels Desktop (version 8). I wonder if I could purchase an upgrade to version 16, or should I go for a new purchase. Thanks.
Probably I am answering this question for myself (although I asked the same question to the Parallels support - they gave me a concise answer): I have already purchased an Upgrade, and could successfully activate my copy of Parallels Desktop 16.5. Surprisingly the activation did not ask me for the serial key of Desktop 8 (although I could still manage to get it from my account page).