Old 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 The 32-bit platform upon which the iPad4 is based is obsolete.

App Developers have dropped all support for 32-bit devices and many for iOS versions preceding iOS11/12/13 - and have withdrawn older versions of their Apps from the Apple App Store.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 Once compatible versions Apps are withdrawn, you’ll not be able (re)download or (re)install them.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, your only option is to replace your iPad with newer model. Of current models, even the entry-level iPad9 supports current iPadOS 15 - and has hardware specifications and capabilities that vastly outperform an old iPad4.

The current version of iTunes for Windows requires a Windows PC with Windows 10/11 installed.

While iCloud services should still synchronise with your iPad4, some services may not be still be compatible with obsolete devices. Sometimes signing-out from iCloud and performing a forced-restart of the device - before signing-in again to iCloud - can resolve an iCloud problem.

Your disappointment not withstanding, the iPad4 was released in January 2013 - just shy of ten years ago. Computers, like all technology, eventually reach the end of their usable life - in this respect, while Apple devices have a much longer support life than most, your iPad is no different.

Your biggest issue is perhaps that third-party App developers have long ago dropped all support for obsolete 32-bit computing devices - and it is this that is the biggest impediment to continued usefulness of your [still working but technically obsolete] iPad4.