title: Publishing a free app on WP8 store then make it not free
body: <p>I need help with publishing an app me and my team developed. It currently is in beta phase and we need testers. We thought of publishing it in the store as an open free beta app and ask for people to download it and report their bugs. After all the testing bugs are fixed the app will go public as v1.0 but not as free. We do however want the people who originally downloaded it to get all the updates for free as a reward for their help of testing our help and never have to pay for the app. How can that be done?</p>