PDFpen Scan+: You can back down from v1.5 and later to any previous version. PDFpen for iPhone, PDFpen for iPad: You can back down to any previous version. TextExpander touch 3: You cannot backdown from v.3 to v.2. 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. This is not a distinction you normally need to be aware of, except in this specific circumstance. Now, sign in using your newly-created Apple ID.
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Tap on your existing Apple ID and select 'Sign Out' if you have one signed in. 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. On your iPhone or iPad, go to Settings->iTunes & App Store.
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For example, after purchasing iPhoto for your iOS 8 device, you can install an earlier compatible version of iPhoto from your iOS 7 device.
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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: You can find the app in the Recently Added category in App Library. If required, authenticate your Apple ID with Face ID, Touch ID, or your passcode to complete your purchase. I have an older version of iOS, how can I download a version of the app which is compatible? If you see instead of a price, you already purchased the app, and you can download it again for free.