How Do I set up a site for clients to download our company's software?

[esfinc]

Does anyone know how I can set up a site for clients to download our company's software? I actually have a site set up already, but it's not exactly what I want. It currently is set up so individual files can be downloaded, but Product 1, an application, has 2 files associated with it (one is the application, the other is an autorun install file); Product 2 has about 16 files. I would like my client to log in (so I know who is downloading what), then click on a download button for Product 1, and both files download in 1 folder to client's desktop, and even install automatically. Product 2 cannot self install, but as before, I'd like my client to log in, click on a download button for for Product 2, and all files are downloaded in 1 folder to client's desktop. It would also be great if they can only download it once (they do have to have a registration # to run it).

These clients usually pay in conjunction with other services we offer, so I don't have to collect for these clients. In the future, we would like to be able to have a shopping cart and offer our books and products to a large audience.

Can anyone help, especially on how to set up a page on my site to download a bundle of files issue?

I use Bravenet as my host, work on a Mac, use Taco to help me write code, though know enough html to get by (did my whole website, though it's still in progress, and I know lots of links don't work because I never have time to fix anything), use mostly Firefox or Safari browsers, know enough about using Win XP to get by (but not switch to a PC)

Thanks,
Mary