You can register Plane Plotter online here. You will need the serial number of your installation. At the time of writing, it costs just €25 + EU tax.
Bev wrote in the PlanePlotter Yahoo group:
Watch this video which Bev has provided.
Use the Help, About menu to display your registration number and share code. You will get a line like:
PlanePlotter version 5.4.6 - Registered {1234} qq
The number inside the curly brackets {1234} is your serial number, and should be used when requesting additional licences (enter it as PP1234). "qq" is your share code, which appears as "*q" on your chart display. Note that others see your full code - "qq" - but your own aircraft show as "*q" on your own display - that's "star" or "asterisk" replacing the first character of your share code.
Because Save Restore Point (previously Save Configuration) saves your entire settings - including your registration key - people can get into the confusing state of being registered one day, and then on day 56 of their 21-day trial the next.
To avoid this, please be sure to enter you registration key before using the save and load settings functions.