Let me add my voice to the concerns expressed about your current upgrade policy.
As a retired software consultant and long-time user of Parallels Desktop, I can appreciate your need to receive revenue for software upgrades. That's the business. On the other hand, the company needs to attend to customer satisfaction. I purchased my copy of Parallels Desktop around six weeks prior to the release of V11. It was not really all that necessary, yet I wanted to "stay current" with the software. Knowing a new version was imminent, like others, I would have delayed my purchase, spending the same amount of money for the current version.
Maybe your policies were not intended to be deceptive and customer unfriendly, but they appear that way. I would like to request some concession for those of us upgrading your product within a more reasonable window. Thank you.