During an upgrade of Archive Manager, an error is found in the installer.log similar to :
"System.UnauthorizedAccessException: Access to the path 'C:\Program Files (x86)\Quest Software\ArchiveManager\AfterMail Common.dll.bak' is denied."
Check task manager for any orphaned threads, close these and attempt installation again.
If error persists, restart the Archive Manager server and run installer again.
