Finally a solution is on the horizon...
I went through a crazy voyage with my CS5 Creative Suite PS Version,
You have to consider serveral things that could be an issue
-> update to 12.0.4 or even 12.0.5 here you find a way to run "old" incompatible updater... be sure to run them with sudo https://forums.adobe.com/thread/2552114
-> Font Setting in PS, set preview to small, if this isn´t set, PS will crash on using font tool, by rendering the font preview box
-> This https://www.macworld.co.uk/how-to/mac-software/open-apps-wont-work-mojave-photoshop-3684425/ was my second issue... and i ran into another version of it, from one day to the other, PS crashed when i tried to use for e.g. tools or move the image. I tried a lot of stuff. But i forgot to maybe consider to reimplement the security thing mentioned in linked article...
-> Another issue could be messed up fonts, use FontBook to scan your fonts, remove all which are marked RED
-> Sometimes Old Plugins could also crash PS... try to disable them with the Adobe Extension Manager, depending on your installation, you have to maybe run the Manager wih root, terminal: sudo (drag here the .dmg -> show package content -> Contents -> MacOS -> AdobePatchInstaller to insert the path in the terminal)
The only thing i could´nt get rid of is the crash message when i close PS
So i hope this helps