Where is My Apps???

I paid for the premium version and have a lot of pictures on my app. After updating to IOS 11, I cant access my photos anymore. Cant even open the app. It says developer needs to update the app to be compatible with IOS 11. PLEASE FIX

Update: Ive been reaching out to the developer for weeks now and still NO RESPONSE. Wish I could give them zero stars.

JennR. about Secret Apps Photo Vault, v3.2.13