Which error message you get exactly?
The problem started about 3 months ago despite successfully downloading books previously. I have tried many books without success. Here's the message I get:
Adobe Acrobat Reader DC could not open (my book's name) because it is either not a supported file type of because the file has been damaged (for example, it was sent as an e-mail attachment and wasn't correctly decoded).
I do not open the file from the e-mail notification I receive that the book is available - I go back to the library's website and download from my account/library card.
I operate on Windows 10. What is the optimal combination of software/versions I should be using ADE 3.0 or 4.3, 4.8?
I've tried reinstalling everything including Kobo software. Still doesn't work.
To open eBooks used Digital Edition. Adobe Reader is a program to open PDFs.
Start Digital Edition. Go to File > add to library. Choose the download file.