Please take care, that all letters are capitalized. Furthermore, we do not use O (Oh) or 0 (Zero). Make sure, that there are no blank spaces in front or after the serial key. You can copy this number to Windows clipboard by pressing Ctrl+C. By pressing Ctrl+V, you can paste it into the field ‘serial key’. 

You can als try to start our software with a right click and the option "Start as administrator".

However, if you do not get the desired result, please feel free to contact our support. Please send us the name of the program and the license key.