Well, that worked. I think. When I first tried to rename it, it wouldn't let me -- again, a permissions issue. Then I rebooted, and tried again to rename the Adobe folder to something else (Adobe2)..and this time it worked! Then I tried the whole download and install process, which created a brand new Adobe folder, and everything completed successfully. So I'm not sure if it was the rename, or the reboot, or both...but in the end, I can now open PDF files, which is what I was after all along. Thanks for the tip!
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