Many of my pdf files that used to open now no longer will. (I get the message that includes the words "either not a supported file type or because the file has been damaged"). I tried the workaround of going back to 11.0.0, but that did not fix anything. I have not tried going back to 10.1.5 — it seems weird to have to continue to revert back & also, I did not know whether this was intended for folks who did not have Acrobat XI. I'm on Mac. Please let me know how to fix this problem.
Thank you!