
If the value you're entering is longer than 15 characters, you have a product key. The dialog where you enter the serial number looks like this: To activate the program with a serial number, you need to have the serial number version installed. If the value you're entering is short (fewer than 15 characters), you have a serial number. Please re-enter serial number") when you enter your product key or serial number, it's possible you have the wrong version installed.

If you are getting an error ("The product key entered is not valid" or "Invalid serial number. Grapher 12, Surfer 13, and Strater 5 each have two versions: a product key version and a serial number version.
