

A more complex solution is to install on a separate partition. No doubt this will hit those still using CS6/LR6 and before so wait for the squeals and roars before the death knell eventually sounds but the simple solution is not to upgrade ever. If using Adobe software professionally or semi-professionally then it is certainly most unwise to update immediately or even soon until everything one uses is known to be working.

Make sure to turn off all the auto-update features anyway just in case. I am still running High Sierra (last version was Mojave by the way). Apple have been issuing numerous warnings about the final transition to 64 bit for some time now and they don't shove it down your throat unlike some other OS vendors. I think it goes without saying that one should be very wary before upgrading to a new OS as there will always be stuff that doesn't work straightaway or perhaps never - software and hardware.
