https://wccftech.com/download-ios-12-4-5-iphone-and-ipad/

You can now download iOS 12.4.5 for older iPhone and iPad devices, including the iPhone 6, iPhone 6 Plus, iPad Air, iPad mini 3, iPod touch 6 and more.

Apple released iOS 13.3.1 and iPadOS 13.3.1 yesterday. But interestingly, those with older and iPhones and iPads were surprised with the release of iOS 12.4.5. While it's true that Apple has dropped support for lots of devices with the release of iOS 13, it is still great to see that the company has been releasing maintenance updates for quite some time now in order to keep devices safe on the security front. And if you download iOS 12.4.5 right now, you will realize that it is nothing more than a security-related update. This means that if you have an older device with you, you should go ahead and download it right now. Don't expect any new features from this update at all as there are none.