Apple's "app thinning" feature implementation in iOS 9 makes it all the more difficult to "save a version of an app" because iTunes no longer syncs apps into th

Apple's "app thinning" feature implementation in iOS 9 makes it all the more difficult to "save a version of an app" because iTunes no longer syncs apps into the computer, like it used to before. Any app downloaded on to the device directly from the app store is a device specific thinned version. If you replace the device with a new one, you would have to just get all the latest versions of the apps from the app store. The only inconvenient solution, in my knowledge, is to always purchase and download apps and even update apps from iTunes on a computer. This would make iTunes download a "universal" (for lack of a better term) app file that would run on all compatible devices. Then sync the apps from iTunes to the devices. You lose the advantage of app thinning and use more storage (like in iOS 8 and previous versions), but you would have access to the specific version that you have used and want to keep using. I emphasized the word "implementation" above because it was not necessary for Apple to disable iTunes from syncing apps on to a computer with the thinned apps. Technically, there are many ways to store device specific copies of an app with the same name on the computer, which for some reason Apple has not even considered. [Apple never allowed downgrading of apps without resorting to iTunes, but that's a different and larger topic] Overall, the push to use the latest version of any app is really frustrating and will result in more backlash as people realize how much freedom they're losing.