That's correct, run the installer provided by the "Free Trial" option on my website and then send me the Activation Number that appears when you first open the software.
If you entered "TRIAL" for the key, then you can delete that key by opening the Settings screen and then click on the button at the bottom left that says something like "Upgrade you license key". My website will appear, just close it out. Now you'll see the Activation Number again if you restart the software.