Beyond Compare licenses are for specific major versions. A license key for Version 3 or Version 5 will not work for Version 4 .

Delete the key file typically located in ~/Library/Application Support/Beyond Compare/ .

You must delete the existing license file to clear the error.

If a purchased license key is shared on public forums or gists, the developer ( Scooter Software ) may revoke it to prevent unauthorized use.

When using , encountering a "license key has been revoked" message can be a significant disruption. This typically happens when a key is leaked publicly or if you are attempting to use a key for a different major version of the software. Common Causes for Revoked Licenses

Open Beyond Compare and go to Help > Enter Key to paste your legitimate license information. Legal and Free Alternatives

Delete %appdata%\Scooter Software\Beyond Compare 4\BC4Key.txt .

Using "free" keys found on the internet often leads to revocation once the software performs a routine check. How to Fix a Revoked License Message