In some cases, it is possible that Revo Uninstaller Pro’s license file becomes corrupt or damaged. This necessitates that it is deleted and recreated.
Navigate to the C:\ProgramData folder.
This folder is hidden by default so you would need to show the hidden files and folders in Windows Explorer.
Alternatively, you can type the path directly in Windows Explorer’s address bar, and press Enter.
After you have opened ProgramData, find the VS Revo Group folder, and delete it.
Deleting the folder would most likely prompt you to grant administrator privileges, so click Continue.
After the VS Revo Group folder has been deleted, you would need to install Revo Uninstaller Pro again so that a new license file is created.
You can then try again to activate Revo Uninstaller Pro.