The location of the ArcPad registration code is found at different locations in the system directory depending on the version of ArcPad installed.
Warning: The instructions below include making changes to essential parts of your operating system. It is recommended that you backup your operating system and files, including the registry, before proceeding. Consult a qualified computer systems professional, if necessary. Esri cannot guarantee results from incorrect modifications while following these instructions. Therefore, use caution and proceed at your own risk.
To access the Windows Registry Editor:
In ArcPad 8.x:
Registry Editor > HKEY_LOCAL_MACHINE > Software > Wow6432Node > ESRI > ArcPad > SerialNumber
In ArcPad 7.x: