Upon first run of PSTC, it will prompt you for your product key. On the main menu, press configuration to bring up the licensing page.
Figure 1: PSTC Main Menu - Configuration button
On the license tab, press Activate License to enter your product activation.
Figure 2: PSTC Settings Editor - License tab
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 3: Product Activation window
Once successfully activated, your license information will be visible on the license tab and PSTC will be active.
Figure 4: PSTC Settings Editor - License tab with activated license