In order to activate SpeedUpMyPC version 3 having purchased a license code you must load the interface and then click the 'Register Now' button from the Overview window. Enter the Serial Number in the field provided and click the 'Activate Now' button.The Overview window should now display 'Registered Version. Please do not distribute.'
If you lost your serial number, you can request it from the following page :
http://www.liutilities.com/support/regkey/