pinnacle 21 community previous version

As you don't seem to get a…

As you don't seem to get a formal answer ...
See different other postings with P21 answer like:
"Pinnacle 21 does not support older versions of applications to ensure correct functionality of the validator and to meet regulatory agency requirements."

Question back to all users: as updates are done automatically and without notice, how do you validate after such an automated update? Start over all again?