Hi
I tried to get your component with your component code and got a 100% discount code. However, I was redirected to paypal, who didn't accept a payment of 0$, so I tried changing it to 0.01. That went through. When I returned to your site I couldn't download anything and my orders said: You have no orders yet
Also the flow of adding to cart - need to register - validate email - add to cart once again - pay is not optimal. You should consider loosing the validation part, and perhaps look at mijoshop as an alternative to virtuemart?? It's an opencart based solution and it's very powerfull.
Anyway, I would like to test your component, but wasn't able to