: Check your original order email. Ensure you are copying the entire key string , including the --- BEGIN LICENSE KEY --- --- END LICENSE KEY --- Clean the Old License Data

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Navigate to the Beyond Compare 4 installation directory (usually C:\Program Files\Beyond Compare 4 ), locate BCUnrar.dll , and rename it (e.g., to BCUnrar.dll.bak ). This disables certain features that trigger license checks. If that doesn't work, uninstall the software, restart your computer, reinstall, and rename the DLL before launching.

Advanced features like 3-way merge and SFTP support.

The core solution involves making the software "forget" the revoked key by resetting its local state. Think of it as performing a "selective amnesia" procedure on the software. The goal is to delete the local files that store the revoked key status, allowing you to re-enter a valid license or reset the trial period.

If you purchased a legal copy but are experiencing a glitch, clearing the old registration data forces Beyond Compare to accept a clean registration input. Close Beyond Compare 4 completely. Press Windows Key + R to open the Run dialog box.

Delete this file to clear the revoked key from your user profile. Close Beyond Compare 4.