Adobe CS5 Mac iOS High Sierra 10.13.6 Just stopped working! Help
After paying $1800 at the time for Adobe Creative Suite CS5, I too have no desire to go to a cloud based &quot;pay for play&quot; software, especially during these uncertain financial times.
Have you tried having two hard drives which contain two different operating systems on them?
I have Mac OS 10.8.5 on one hard drive so that I can used Steinberg's Cubase version 6, and I have MAC OS 10.13.6 Hign Sierra on a my main hard drive - I just switch to my &quot;downgrade&quot; hard drive and keep working...and you can access both drives from the menu like normal.
That was my saving grace!  I can still use Photoshop on 10.13.6, but it won't let me run Adobe Premiere CS5.
Sadly, in all my Mac years no one ever told me I could do that.  It would've saved me a lot of upgrade money when a new OS didn't work with my audio software (especially WAVES plugins which I paid lots of money for and it became obsolete, since WAVES too is on a cloud-based-pay-to-play model)
Hope this helps.