How to Register: The 3 hour issue and the workaround is pretty well documented here on Demonoid i n older versions. Basically do the following: 1. Delete older versions using the installer or a program like AppZapper, AppCle aner or AppDelete. 2. Delete the folder ~/library/Application Support/Objective Development/Little Snitch 3. Delete the folder /library/Application Support/Little Snitch sometimes these two folders are not deleted by the delete programs 4. Install your new version DO NOT PUT IN THE SERIAL YET 5. Add a new rule in LS, preventing it to phone home. Tell it to "deny connection" to: /Library/Little Snitch/Little Snitch UIAgent.ap p Server: Any Server Port: Any Protocol: Any 6. Put in your serial number and it should work fine. Say Thanks to gmacman Here the new SN: 32SCDALRF0-715HA-5D7067ZY23