I have a client running Catalina on an old 2013 iMac with a spinner. There's no
reason he needs to be running Catalina (he still uses Lotus 123, for heaven's
sake), he is apparently just a low-information victim of Apple's antisocial
robo-nag campaign to "Upgrade! Upgrade!! Upgrade!!!"
His machine is now crawling.
My preference would be to clone his machine to an external, wiping it, install
fresh High Sierra, and then migrate his files back in. But I'm unsure whether
there have been format changes between HS and Catalina in personal databases
such as Photos, Address Book, mailboxes, and the like that would queer this… or
whether File Migration might just arbitrarily nix the importation out of
principle. Not to mention knowing that the System Settings category (WiFi
networks, Apple IDs, Sharing, Accessibility, etc.) would probably be
un-migratable in toto, but that's less important as it can be addressed
manually.
Can anyone say if this reverse-migration is doomed before it's tried?
The alternative would be to swap out his HDD with an SSD and clone it over,
which would be a more costly job in terms of hardware fiddlery time (I hate
working on iMacs, having to disconnect all the fragile display screen
connectors to do the simplest things), pus the cost of a new TB drive.
(Damn Apple's irresponsible pressure on typical consumers to upgrade their
OSes.)
--
Macs R We -- Personal Macintosh Service and Support
in the Wickenburg and far Northwest Valley Areas.
http://macsrwe.com
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