NB: This question has been extensively edited to make it more relevant, for completeness the original question maintained at the end.
When building a new iOS app what a strategies should one use to determine what versions of the operating system to support? What practical considerations are there in supporting legacy OS version. Are there any reliable statistics to support the business case of dropping legacy support?
If I build a new iOS application, should I support iOS versions prior to 5.0, or is that not necessary anymore? Is there any reliable and up to date data on iOS 5.0 adoption rates?
Nonetheless, you should be supporting iOS 6 by now and aspiring to support iOS 7 (if you aren't already). Overall, no matter what your scenario is, I highly recommend that you only support the latest two versions. Supporting the latest three iOS versions would only be necessary on the brink of a new iOS release.
This means that your existing iPhone and iPad will stop running apps that have not been updated (by the developer, or maybe you have been too lazy to update them via the App Store) to the newer and more efficient 64-bit architecture, once you update the device with iOS 11.
Download an older app version:Go to the Purchased screen. For iPhone the Purchase screen is in the Updates tab. Select the app you want to download. If a compatible version of the app is available for your version of iOS simply confirm that you want to download it.
It's possible that you're trying to update an app that is out of date and no longer supported by iOS. Try downloading a different app to see if this is what's causing the update to fail. Try searching for the app in the App Store, if it isn't showing up it's likely that it's been removed.
This version is updated and includes iOS 7.1 and new iPads.
Link: http://www.iossupportmatrix.com
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