audible on 4th gen ipad ?

Update support for iPad4 ended September 2017. The final iOS releases for this model were iOS 10.3.3 (WiFi Only models) and iOS 10.3.4 (WiFi & Cellular). iPad4 cannot be updated to any later major version of iOS as it lacks the minimum hardware requirements needed to run more recent versions. The 32-bit platform upon which the iPad4 is based is fully obsolete.

App Developers have dropped all support for 32-bit devices - and have withdrawn older versions of their Apps from the Apple App Store. Withdrawal of Apps supporting older models of iPad is making their utility and usefulness significantly more limited. Once compatible versions Apps are withdrawn, you’ll not be able (re)download or (re)install them.

If Apps that you need to use now have higher minimum iOS-version requirements than your iPad is capable, such as Audible, your only option is to replace your iPad with a much newer or current model.

For information, here is a list of the highest version of iOS supported by the older models of iPad (for simplicity - “generations” are shortened to a number) that are restricted in their ability to be updated:

32-bit devices (obsolete)

iPad1 - iOS 5.1.1

iPad2, iPad3 and iPad mini1 - iOS 9.3.5 (WiFi Only models), iOS 9.3.6 (WiFi+Cellular)

iPad4 - iOS 10.3.3 (WiFi Only), iOS 10.3.4 (WiFi+Cellular)

64-bit devices

iPad Air1*, iPad mini2* and iPad mini3* - iOS 12.5.8

iPad Air2*, iPad mini4* - iPadOS 15.8.8

iPad5*, iPad Pro (9.7"/12.9" 1st generation)* - iPadOS 16.7.16

iPad6, iPad Pro 12.9" 2nd generation*, iPad Pro 10.5" - iPadOS 17.7.11

iPad7 - iPadOS 18.7.9

(*) obsolete

Newer models are all able to be updated to the current version - iPadOS 26.6

• iPad Pro 13" (M4/M5)
• iPad Pro 12.9" (3rd generation and later)
• iPad Pro 11" (1st generation and later + M4/M5)
• iPad Air (3rd generation and later + M2/M3/M4)
• iPad (8th generation and later + A16)
• iPad mini (5th generation and later + A17 Pro)

NB: iPadOS 27, when released later this year, will drop support for the following models of iPad:

• iPad Pro 12.9" (3rd generation)
• iPad Pro 11" (1st generation)
• iPad (8th generation)
• iPad mini (5th generation)
• iPad Air (3rd generation)

The version that still works on iOS 10, whatever that is.

Considering the only way to get Apps is from the App Store app, not sure what good a specific version number will do for you unless there's a repository of Audible app files where you can find a compatible version.

The App Store offers the most current version of an App that is available and the current version of Audible requires an iPadOS version your iPad 4 cannot run. iPadOS 18.1

The only exception to this is if you have downloaded then app previously, you can possibly get a compatible version of the iPad if the developers keep it available in the store by downloading it from your purchased history.

Otherwise, there's no way you can now get a version of Audible that works on that iPad from the App Store app at this point.

And even if you do manage to find a version if Audible that runs on that iPad and can install it, then there's the question of whether a version that old can still access the Audible server and services. A cursory search on Google.com says no. The iOS 10 version can no longer access the Audible servers due to new security measures in place that it does not support.

One of the versions that no longer exist. Sorry, its going to be difficult to find anything that will run on that 12+ year old iPad.