Avast security update causes error 'The license file in use is invalid'

Description

If you have installed the latest Avast security update, you may receive the following error message when logging into NOAH System 3:

The license file in use is invalid! Please reinstall your NOAH System license file.

Solution

This error occurs because the keylib32.dll file in Avast has been blocked.

To solve this error:

1. In the Avast program, select Maintenance > Virus Chest.
2. Right-click on the keylib32.dll file and select Restore.