Delete %appdata%\Scooter Software\Beyond Compare 4\BC4Key.txt .
You must delete the existing license file to clear the error. beyond compare 4 license key has been revoked free
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
Delete the key file typically located in ~/Library/Application Support/Beyond Compare/ . Legal and Free Alternatives Delete the key file
Ensure you are not accidentally using a leaked key. You can find your official key by logging into your account on the Scooter Software website or by requesting a replacement copy.
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
If a purchased license key is shared on public forums or gists, the developer ( Scooter Software ) may revoke it to prevent unauthorized use.