The App Store allows developers to offer a compatible, earlier version of an app for earlier iOS version users based on Apple's support article here: http://support.apple.com/kb/ht5919
Download an older app version:
- Open the App Store on your device running iOS 4.3.3 or later.
- 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. For example, after purchasing iPhoto for your iOS 8 device, you can install an earlier compatible version of iPhoto from your iOS 7 device.
In order to have access to an older version of an app, both the older and newer versions need to be the same app, in a technical sense. This is not a distinction you normally need to be aware of, except in this specific circumstance.
In the case of many iOS apps, a change in major version number will signal a new app so that you will not be able to backdown from v.3 to v.2 like you might for v.2.5 to v.2.1. ( Not sure which version you are using?)
TextExpander touch 3: You cannot backdown from v.3 to v.2. You can backdown from v.2 to v.1.
PDFpen for iPhone, PDFpen for iPad: You can back down to any previous version.
PDFpen Scan+: You can back down from v1.5 and later to any previous version.
(Applies to iOS 4+.)
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