How to create downloadable products to sell

[degritscio]

Hi there!
I have a new site, and i need to avoid client to see all my electronic products, such as videos, clips, images, manuals and so on ...and avoid client to choose it, select, and then make a checkout witha single clips or multiple clips for example; i see there is an extension that add a more possibilites in media files, not only downloadable , but "to sell" too...
But this kind of extension don't permit to download directly the files after checkout, just with an email....
Do u know another system to create these downloadable products i dont know with another plugin or just with Virtuemart too? Thanks!!