What license entitles me to upgrade pricing?

I used parallels many years ago and am thinking of revisiting.
According to my account I bought parallels 7 and upgraded up to version 10. These are all 'legacy licenses'
Am I entitled to current upgrade pricing? If so, which of the licenses in my account should I use as the 'previous license' for entitlement?

 

I am not associated with Parallels, so I do not know for sure. That said, a post from Parallels that I read a moment ago indicated that upgrade keys have to be applied against one of the two previous versions of Parallels. As Parallels 16 is now being sold, that would imply that you could upgrade PD14 or PD15, but that your PD10 is too old to use an upgrade with.

Reference: https://forum.parallels.com/threads...from-the-previous-version.344752/#post-841943