We just had an app update get approved in the App Store today. However, on some devices, when we download the app, even after completely deleting it first, it is installing the previous version. Is the device somehow remembering the old version? How is this possible? Some devices that weren't used as much for development seem to download the correct version from today.
What could be going on here?
Have these devices ever installed your app via TestFlight? We had this issue and TestFlight was causing a similar issue. We would try to download the app from the App Store, and an older app version would be installed. Funny enough, after installing this older app and returning to the App Store, we would be informed that there was an update available for our app, and we would be able to update to the correct version at this point.
Removing TestFlight and its associated profiles didn't seem to help; a factory reset of the phone did the trick.
I don't know about TestFlight. But, I had this issue when my new version of app gets to "Ready for Sale". Spent long time searching for a solution for this issue.
Surprisingly about an hour it got resolved by itself. So, I advice you to be patient it works by itself after a while.
There's a timing discrepancy between the time your app gets to "Ready for Sale", the time your new keywords (if any) gets indexed by the App Store, and the time the binary downloads actually get updated. From our experience they don't get longer than an hour, but I can imagine that a lot of factors affect this lag.
If it does take inconveniently long then it's probably a good idea to report it to Apple.
来源：https://stackoverflow.com/questions/12700934/ios-old-versions-of-app-getting-installed-from-the-app-store