I have developed a promotional website for an iOS application. The introductory view of the page contains - aside from a short description and screenshots - an official AppStore badge, which will link to my application's iTunes page. Now, what if the user is not quite sure, if he/she wants to download this app and scrolls down to get to know more about it ? Where would be (a) good place(s) to put a download button ? 

Previous iterations of this very page had a fixed badge at the top-left corner of the page, which basically led the users to my iTunes product page. Is this encouraging and recommended ? Or will it just end up being a nuisance to the user ? 

Should I maybe introduce the download button every x pixels, or just at the end of the page ?

I would love to hear your opinions!