upgrade; downgrade

Good morning. I purchased a Parallels 15 license. Since for a few months I will be using a computer with 32 GB of RAM, I would like to upgrade to Parallels PRO. If I cancel my subscription after a few months, what will happen to my original Parallels 15 license? Will I be able to use it or will...

I had been running Parallels 13 for some time when I decided to give version 14 a trial. I downloaded the dmg file and installed it, but found there was little if any new functionality that I found necessary and so decided to go back to 13, at least for a while. I removed the version 14 desktop...