Upon first run of Color Table Creator, it will prompt you for your product key. On the main menu, press the Product Activation button to open the Product Activation window.
Figure 1: Color Table Creator Main Menu - Product Activation button
Using the information from the email no-reply@mods-for-grx.com enter your email address and product key. Then press validate, if your key is valid you can then activate your license by pressing activate.
Figure 2: Product Activation window
Once successfully activated Color Table Creator will be active. Note that .pal ⇄ .wspal Converter will only be active if you purchased the full version.