15.08.00 version of app crashed on iOS 8.1 iPhone 5

The app crashes on startup even after changing iPhone language to English

You could try updating to iOS 8.4.1?

What’s your calendar layout set as?

I tried but the only version that works on my phone is 14.10.00

Month view

No not that. Go to settings > general > language and region > region formats
What’s under calendar?

Gregorian it is

Oh. Keep your language on English and reinstall the app. See if that works.

Is English India fine or should it be only English or English US OR UK

I’d say US or UK until it gets officially fixed by the developers.

Didn’t work bro hard luck