Hi Margaret - your problem is exactly the same as mine. I was actually in the middle of some Photoshop work when this upgrade wiped it off the face of the earth. I was, as you said, beyond furious because there was no option to delay the upgrade until
I did a save.
I tried the compatibility mode and nothing happened - why is Microsoft suggesting we do that when it is not going to work!
I have not one clue how to revert to 8.1 where Photoshop 5.5 lived happily. I am going to have to waste yet more of my day and working time trying to find out how to do that and wait for the change to occur
Feedback for MS. (for venting purposes because obviously no one will ever read this )
1) Warn your customers that changes made might disable some of their older programs and give them the option to chose to go with the change or not - but maybe that is not commercially appropriate for you because then we would not install your product and
you would not be able to mine all of our data with Windows 10
2) Let them darn well save their work before you come intruding at least
3) Provide tech support that is actually researched - rather than say do this and that and when that doesn't at all work, later blame the developers of the program
4) Dont tell me you will be more than happy to assist when it seems you are clearly just after our data to on-sell.