Adobe Digital Editions

Hello,

I can no longer download books to my e-reader using Adobe Digital Editions 3.0 (a newer version doesn't work, and this is the version recommended by several people... I've also tried newer versions). I'm supposed to click on the book and drag it to my Kobo, but I can't. Yes, my Adobe license is still valid. When I connect my Kobo Libra Color e-reader to my computer, in Adobe, the titles turn pale gray, and I can't click on anything (neither the Kobo tab, nor "File," nor "Help"). This problem occurs every time I switch e-readers or computers. I had already found the solution on Reddit, but I can't find it anymore! It involved copying and pasting an Adobe file into Program Files or deleting it completely; I don't remember exactly.

It seems to be Adobe Editions that has a problem, because I can't even close the application with the "X."

I've restarted it dozens of times, obviously, and even updated my e-reader today.

Can someone please help me? I'm desperate. The library's IT department doesn't know what to do.

Thank you so much.