hi mate, about software : everything is risk because we are lack of copyright that mean violate google policy !
The way you have the "Download" button positioned it looks like it could be a heading for the Google ads. If Google thinks that people might mistakenly click that link when they want to download then your account could get in trouble for "encouraging accidental clicks". (And if you put it there hoping people would click by mistake then that's a bad sign). Here is more from Adsense help: http://adsense.blogspot.com/2007/05/dont-run-risk-of-click-and-miss.html https://www.google.com/adsense/support/bin/answer.py?hl=en&answer=136901 https://www.google.com/adsense/support/bin/answer.py?hl=en&answer=136881
Maybe man, because google is so strict if it becomes to software or anything related to copyright. But that is a good placement though..