I bought Xara Xtreme Pro a long time ago and have used on the different computer I have had over time. I bought another computer and installed Xara. Everytime I start the program it asks me to reenter the serial number. ...which I obligingly do. But once shoud be enough! I bought the program in it's box with CDs, manuals, etc online. From the company itself. This is the genuine product with a genuine serial number printed on the box just below my name!