When you purchase a product from Visual Integrity, you are assigned a serial number. This code is is used along with some other unique data to license your software. It also acts as your customer number. The download that you receive upon purchase is pre-serialized and activated. All you need to do is double-click to install it. If you have an evaluation version on your system already, it will overwrite the files to unlock it. If you have questions, please contact email@example.com.