Although it wasn't simple, and instructions weren't 100% spot-on, I stuck to it. Had to create root and go into it and follow most of the instructions and took 4 days. But did get there, finally.
Mostly thanks to this thread:
Getting error 150:30 opening Photoshop cs4 on Macbook Pro
So, thank you so very much.
Take care never to update Mac OS !
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I don't think I did that. Had to create root, and go into it. I've now disabled it. The instructions I followed related specifically to Adobe re reinstalling, fixing their licensing system. Thanks for your advice. I truly don't understand Macs at all. PCs were no problem, but Macs are a total mystery to me.