Hi to everyone!
I run DDL offer on Pop traffic now, and here my stats:

As you can see, CTR is pretty good, but people don't open APK file much 
With such low payout I don't know how to make it profitable (only way I see - Is to get people to install APK file)
Any suggestions guys? 
Try a landing page with instructions how to install the apk right after people click on the download button.
I used to do this back in the day with mobogenie and it worked out great.
@bbrock32 thanks so much for idea!