If you have an Apple Computer with an M1 chip running the latest macOS version, then the following procedure should solve any downloading problems from a public library you may be experiencing. (It is mainly a summary from the suggestions proposed in the 23 replies submitted so far).
1) Change the name of your Digital Editions folder in the Documents folder (eg shorten to Dig Ed) This will preserve any existing book titles you want to keep.
2) Open Finder and hold down the Option key while accessing the Go menu. Library will appear in the list of available options (under Home). Click on the following links in order: Library/Application Support/Adobe/Digital Editions
Drag activation.dat and any other files that may be lurking in Digital Editions to Bin. ie Delete them from the computer!
3) Delete all versions of Adobe Digital Editions from your Applications folder.
4) Download Adobe Digital Editions 4.5 from the Adobe website.
5)When you first open the app, click on Help/Authorise Computer. Select Adobe id from the long list of registration options. You must now create a new identity, email address and password for yourself. Anything less will be rejected by the Adobe administration. You must use an email address you have never registered with Adobe before (Your Apple id perhaps?). Change your name! (a slight change in the spellings should do) and invent a completely new password.
Your computer will be authorised almost immediately.
6) Log in to your Public Library acccount and select a book to download that you have not previously downloaded on to any of your Apple devices. This book will now appear on the Library page of ADE 4.5 ready for transfer to your Kobo ereader or whatever.
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