download button

Hello BMW community i have a question for your guys. I have a website , which is landing page with an free ebook download. My question is : is it possible to lock the download button with a cpa offer..,, not only with a filelock with random offers .. i like surveys more or something with...

I have a file that I want people to be able to download from my website by first completing an offer. I want it so when they visit the page, they first have to click the download button (which is a picture of a download button) then a content gateway comes up and they have to complete an offer...