If Users download today and purchase past months?

[significadode.info]

HI

I have a 500 right now afiliattes testing the free version. And my question is:

If these members do not buy now but if you decide to buy into one, two, or three months,
this purchase they make, will be reflected in my sales?

if the user enters per my affiliate link and download the free version, and decide to buy last month.. validates that sale is for me? gtrans use a persistent cookie?

Thanks for your reply

[Edvard]

If your referred visitor buys during 1 month then the sale will be counted on you.