For MapInfo Professional 10.5, your serial number and access code are unique credentials provided at the time of purchase or evaluation. If you cannot find them on your Product Activation Information Card or in your confirmation email, you can retrieve them using the following methods: Find Current Credentials
Windows Registry: They can also be found at HKEY_CURRENT_USER\SOFTWARE\MapInfo\MapInfo Professional\1050 under ProductID (Serial Number) and AccessCode. mapinfo professional 10.5 serial number and access code
License Types: The third character of your serial number indicates the license type; "N" typically denotes a node-locked license tied to a specific machine, while others may indicate concurrent (server-based) licenses. Informative Review of Version 10.5 For MapInfo Professional 10