I think you should do some research on this. For it does not work at all.
I installed this version on my live site.
...and I had two costumers who made a real purchase, one tried to purchase three time in a row.
I receive the e-mail that the order has been cancelled, any no payment was made to my paypal account.
.... but the strange thing is that both name and address is filled out in these orders the orders
I don't understand a thing, so I just activated the old Paypal system.
I I think you should to some more development