My fitness pal app

Rpearson100

Hi, I've had my fitness app for 5 years. I can't update it as I have an iPhone 6. It will not take the new iOS. Any ideas on how to get it back on my phone? I've tried deleting the app now I can't get it back on.
Robert

GymGoddessGoals

New phone.

glassyo

Or just google for an older version of the app.