It’s been almost 8 months; please update Fast Capture. The app doesn’t run on iOS 13, and Apple doesn’t support returning to an uncertified version.(iOS 13 and iPadOS 13 were introduced by software engineering director Craig Federighi at the WWDC keynote address on June 3, 2019.[3][4][5]The first beta was made available to registered developers after the keynote.[6]The second beta was released to registered developers on June 18, 2019, and the first public beta was released on June 24, 2019.[7]The initial release of iOS 13.0 was on September 19, 2019.[8])

Please make it work.