Ensure you haven't downloaded a version of the software that is newer than what your license covers (though most AirMyPC licenses cover minor updates).
Once you receive your genuine registration key via email, the process is straightforward: Open the AirMyPC application on your PC. airmypc registration key
However, before you spend hours scouring the web for "cracked" keys or "keygen" files, it is important to understand how the software handles licensing and why the "free" route often leads to more trouble than it’s worth. What is AirMyPC? Ensure you haven't downloaded a version of the