Semi-transparent Download Tracking

let me preface this question by telling you that I cut cable and fix printers. I avoid web stuff whenever possible. But alas, my wealthy benefactors insist . . .

I'm hopefully to the last step in cookieless user-id tracking for file downloads. Here's where I am:

To download such-and-such, user enters their email addy on a form.

Form posts email to an access db which generates a user id

iis creates a link http://domain/downloadid=userid and sends it to the email address entered

At this point I no longer know what to do. Understand that that the above constitutes a poorly modified address book. Here are the caveats for this project:

If you@you.com downloads a file, I want a tick in the db. Be that adding the filename or other marker to your db record or a whole other media-list table that adds your id. Whichever is the simplest.

I'm totally good if it's a dreadfully loose way of tracking (even fake ids would be permitted and tallyed in the db as fake). I'm more interested in usage stats than protecting any of our golden audio files. Hopefully, this very spartan system could become a way to grow some trending data, like "everybody that downloaded X also grabbed a copy of Y" and so forth.

My iis/asp/access knowledge consists of exactly the things I've been forced to do so far. If this is just too cheeseball of a question, feel free to point me to the right chapter in your favorite book and I'll go buy it! My Googling for this one have been returning about 3/4 of the entire internet, so I decided to just ask.