How to get older version of Pokemon go on ios 6.1.6 ipod touch 4th generation

If the developer doesn't support the downloading of older versions of their app in the App Store app you won't be able to. Do you have a copy of an older version of it on your computer or another iOS device (that's not on iOS 9+) or on backup of your downloads/computer so that you can sync/add it via your computer's iTunes ?