I used to be able to open ACSM files without further ado.
But now I get the above indicated error message.
I try to erase the computer authorisation. I cannot erase it. It only says, unable to erase. Try later.
Can you tell me what to do?
Found the instruction I needed a few topics below. Computer authorisation erased and newly set up and the ebook shows up as it should ;0)
Retrieving data ...