Download forms

Please help me with download monitor. I need to collect the contact details of people who download some of pdf’s I have on site. I do not want them to register as user, I simply need their name and contact email address and checkbox to mark whether you want to get newsletters on related topics.

Currently I use contact form 7 plugin, but this means that for each seperate file I have to create a seperate download form.

Maybe there is some kind of download manager, which allows to partially lock the download file and puts the contact details of people who has downloaded the file in some kind of database.

Many thanks in advance!