Trying to open a downloaded acsm file and getting message box "error! check activation".

[ba24b705-60e4-4179-8c05-e]

Checked authorization and computer is authorized. Unable to deauthorize.

[LeiraHoward]

I had this exact same error, and deactivation was not working. I ended up closing the software, going into the registry, and removing the Adobe key HKEY_CURRENT_USER\Software\Adobe\Adept (follow the instructions below the disclaimer on this page: Error "E_AUTH_NOT_READY" | Digital Editions ) After that, going back in to the software and reactivating worked.

[sceptical2011]

Had this problem tonight - deleting the Adept key in registry and re-authorising worked for me.

I've Ver 4.5.4