Version update fix
The latest version stalled on the update, but it was an easy fix. This method worked for me.
Go to: Settings > General > Storage & iCloud Usage > Manage Storage, and delete the app from that menu. Then re-install from the App Store. After which, the download was quick and complete. However, fair warning, it is likely you will lose previous saved data from the application library.
Aside from the glitch, this is my go-to video program, so yeah, five stars.
CoryTek about
Filmic Pro-Video Camera, v5.1.1