So I went to my iPhone's App Store to download Thinkware's Dashcam Viewer for my F770, and see that it cost $4.99. Thinkware's' web site says it's a free app. The App says it is free too. But as soon as I click "get" and sign on with my Apple password, I'm asked to verify my payment method for the $4.99 charge. So is it free or does it really cost 5 bucks??