No, that button is on their own site (landing page). If you want to prove that saying “download for free” and then demanding payment is not a trick - don't wast

No, that button is on their own site (landing page). If you want to prove that saying “download for free” and then demanding payment is not a trick - don't waste your time. App Store has an “In-app purchases” option not for tricksters like this, but for applications that provide additional functionality or services for additional payment.