Goes to paypal even with a 100% off Indefinite discount on pro sites

Goes to paypal even with a 100% off Indefinite discount on pro sites
PLUS I forgot how to change URL to my own rather then websitedoamain.com/pro-sites
I set up a custom checkout page but this says:
http://wordpresstestdrive.com/pro-site/
I solved this here but forgot how I did it...
https://themebuilding.studio/get-started/
Thanks - Carpe Diem - Robert
PS: So how do I stop going to payment if coupon is 100% off for Indefinite discount?