I suffer from AVID anxiety.
I previously had a Pro Tools 12 perpetual license in 2016. When it came time to renew in 2017, I unfortunately misunderstood their plans/upgrades/smoke and mirror packages and picked up a one year subscription (thinking that the word 'subscription' meant that when the subscription period ended, that I would get to keep everything up until that point, just like a magazine subscription for example). I also thought a perpetual license was a license that would never expire, boy was I wrong!
To cut a long story short, in the process of buying a subscription back then, I ended up losing the Pro Tools 12 "Perpetual" license. Avid would not give it back and said that at the end of the subscription period I would either have to subscribe again, buy another perpetual license or go back to Pro Tools 11, (which I also have a Perpetual license for).
I spent almost 6 months arguing with them about it, but they would not budge. In the end they decided that they would, in their words, make me a "generous" offer, and would reinstate my Pro Tools 12 license for $99 so that I wouldn't have to pay full price for a perpetual license (which I previously owned!). After all the stress I had dealing with them, I just paid to have my license reinstated and cut my ties with the company.
I still have not installed PT12 on my iLok or computer since then, so not sure what to expect when I do try it in future, considering that PT12 is a generation ago.