It seems like an Alert method/system would help ease user tensions when an update turns out to be faulty. I think this could be an email to users, a popup on Quicken launch, and immediate post on the community forums.
Here is an example situation that I think would have benefited from such an alert.
https://community.quicken.com/discussion/7909601/r39-17-r39-21-paycheck-corruption-edited/p1 As you can read, a lot of users discovered the issue and worked hours to get their data restored. I think many could have avoided the install with an appropriate notice. Thanks!