Downloaded a library book to the hard drive. When I tried to open it in Digital Edition 2.0 (i need 2.0 because it is a first generation Nook) got the following error: "Adobe Acrobat DC could not open "[title of book] .acsm" because it is either not a supported file type or because the file has been damaged." Don't care why or how this happened: just want to fix it. Help!
Open Digital Edition.
Go to File > add to Library.
Choose the file.
Then should open the eBook.
It looks like your associations have been lost. Google "associate file types" to fine how to associate acsm file with ADE instead of acrobat.