Paulwms

I recently upgrade my MAC OS to Mojave. To my knowledge, Apple never included any warnings that some software applications may not run using the Mojave OS. I use Lightroom, Photoshop CS5 and Photomatix Pro quite a bit. Lightroom runs to my satisfaction so far but both Photoshop and Photomatix quit as soon as you try to take an action. Has anyone experienced this? If so, is there a solution available?

MT Shooter Loc: Montana

All Apple users are aware (or should be) that OS updates will preclude older software from compatibility. Thats primarily why Apple updates their OS so often.

jethro779 Loc: Tucson, AZ

If you shut you iMac down and restart it you will get a message telling you that there are programs that are no longer optimized for your Mac with the next version of OS 10. Catalina. The programs are all 32 bit programs and they will no longer work with the newest version of OS coming this fall. The message also tells you how to find which programs are 32 bit and that you will need to contact the maker(in your case Adobe) and ask them when they will upgrade to 64 bit programs. According to my system report all my Adobe programs are 32 bit and they will not work if I upload Catalina this fall.

Paulwms

Thanks for the replies. Apparently Mojave is 64 bit. That is the word I get from Adobe. Is it possible to downgrade a MAC OS back to 32 bit?

jethro779 Loc: Tucson, AZ

My understanding of the way OS 10 is set up is that 64 bit programming was introduced in 2005 and with the update to Catalina all programs must be 64 bit to run on a Mac. All iMac's were configured for 64 bit from 2007.