After you have purchased a license, do not forget to come to upgrade your product with the last updated version (Licences are valid unlimitedly and all updates are free after you have purchased a licence).
To verify which is your own version : click "Help" in the bar menu of the software then click on "enter product key" => a small window will open and will confirm that operation succeeded
To obtain the last updated version after you have purchased a licence and after you have entered the key product, you have juste to download the current demo version, and it will work unlimitedly with complete functions on your computer
Try the complete version of Repetition Detector 2 for free
http://www.repetition-detector.com