How do I recover my license key / serial number? appsolute GmbH January 07, 2015 14:45 Updated Follow Please use our serial number recovery tool. If you are still unable to recover your serial number please contact our support and provide the following information: Name Address E-Mail Order number Related articles I upgraded to MAMP PRO 5 and I am missing databases. I want to revert back to MAMP PRO 4.5. How do I do a complete uninstall and re-install of MAMP PRO? Are updates free of charge? Where do I find my registration number? Comments 0 comments Article is closed for comments.