Media Offline after updating Premiere Elements

I was in the middle of two different products with Premiere Elements 18. Because my Adobe products are offered to me through my university, I have to put in a new access code once a year.  Because I only had an access code for Elements 19, I downloaded the new version. Since downloading it, my project files say "media offline". The location of all of my video clips have not changed, but when I am asked where they are located, it says "file importer reported a generic error". When I try to reimport each of the clips, they still say media offline. When I searched the forums, the suggestion was to clear the media cache and let it rebuild overnight. I tried that, but I still have no luck. I've been having a new problem every week, and I thought that by updating Premiere it would be the end of my woes. This has already not been the case.

What else can I try?