Aruba, Jamaica, but never Catalina

I have a client who, bullied by the incessant nag messages from Apple to upgrade his iMac to Catalina, did so. Now he is experiencing random crashes and wants to downgrade back to Mojave. Of course, he has no backup history.

I can save his current system off via Time Machine or clone, and then reinitialize his iMac to Mojave, though I realize I run the risk of file migration refusing to migrate in that direction. If that occurs, the best I will be able to do is a whole-blood transfusion of his home folder, which at best may leave a few facilities ajar.

It will be worse if Catalina made major format changes to any of the centralized user data catalogs, the big three of which are Mail, iPhoto, and iTunes.

Can someone who has installed Catalina tell me if any of those three apps issued a "please wait while I reformat your database" message when they upgraded?

-- 
  Macs R We -- Personal Macintosh Service and Support
    in the Wickenburg and far Northwest Valley Areas.
                            http://macsrwe.com

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