Overview
When trying to upgrade ListManager, the upgrade may silently finish without making any changes to the system and fail. You will also notice that your security software has an error thread "Unauthorized file encryption" reported on an LM installer file.
Solution
This issue has been reported by users where their security applications report the error "Unauthorized file encryption" with LM installers. Please note that LM installers are scanned for any harmful viruses before being uploaded to the download site. You can disable your security application client temporarily while upgrading LM to avoid the above error.
Testing
The security software client is disabled and the ListManager installer is run. This should result in a successful upgrade of the system.