First of all sorry the tool not works on your system but if you read the page:
"*Test DEMO and read the Limitations List before buying!!*"
This makes sure the game/tool works on your machine and it works perfectly with all the possible limitations or OS errors and give you an idea if worth purchase on your system. This is made to avoid scams like purchase and ask for refund due not works when they do.
Btw, about how to ask for a refund: