Search your inbox for emails from Mobatek or 2Checkout/Verifone (their payment processor). Your original purchase confirmation contains a direct download link for your licensed version.
This file contains your specific licensing details, encrypted by Mobatek. It grants you access to the Professional features and removes the session limitations found in the Home edition. Where to Find Your License Key Location
Older versions might store configuration in C:\Users\%USERNAME%\AppData\Roaming\MobaXterm . Professional Review Summary