Documents 6

How can I revert to Documents 5? I have backed up to iCloud but not iTunes in a while. Im very upset because I loved D5 which actually worked great but Documents 6 wont even open. I dont even have an old phone-its a new iPhone 6s, plenty of memory, did soft reset/restarted the phone multiple times, signed in and out of iTunes as instructed by Readdle. Documents 6 tries to open, cant then closes to my home screen every time. I dont want to lose all my media from Documents 5 or I would just delete the app and reinstall.

Kasey45 about Documents: File Manager & Docs, v6.0.1