Anyone suggest the best way to do this:

Visitors click on to my site and they see brief descriptions of about ten tutorials (text & videos)
If they want to see the complete version of the tutorials they must click on Paypal button to buy and then immediately have access to the full website version

Do I have to create a separate directory which contains the complete (purchasable ) version? (file size would be about 100mb)

How do they view it having paid for it?

Is it better to create an .exe file of the paid-for version that the purchaser then can download?

Thanks for any advice