You are welcome to continue using the game in Demo Mode, but to enjoy its full potential you must obtain a licence key.
You can buy a Licence key using PayPal at a cost of GBP 25.00 Simply enter the serial number of the game (displayed when the game starts) and click the 'Buy Now' button to purchase your licence key.
This is not an automated process, so please allow a 24-48 hours for a response, just in case I am away.
Recently, PayPal has been a bit hit-and-miss sending me alerts when payments are received; if you have not received your licence key after 48 hours then please drop me an email.