I thought about this: Sites like sharecash require a survey before you can download. Maybe this is possible with your own cpa offers to. Anyway, the idea was to download some random software ( that will get downloaded a lot like winamp or something ) Make 1 extra screen in the installer, where you make a button where they will first get the survey. After they completed it, the installer will go further. I think a lot of people will do this, as they allready downloaded the file and started the install. Anyway, not sure if this will get your cpa account banned pretty quick.