Host version – Trivia Bowl Buzzer Review

I have used this app for my academic bowl team’s practices for several years. I have purchased the host version for three different devices (my iPhone, a school iPad, and a substitute’s iPhone). All of a sudden the app will not open. When I try it flashes open and closes immediately. I went to the App Store and reloaded it, but it wants me to purchase the host version again. How can I use this app without purchasing it again?
Review by ABcoach on Trivia Bowl Buzzer.