If everything looks good, go ahead and download iOS 15 at your earliest convenience. If there's a game-breaking bug that Apple needs to patch, wait for a follow-up update to come out and download it then. For users worried about this, it's perfectly fine to wait and see what the public response to iOS 15 is once people have started using it on their own iPhones. Apple tends to squash most of these during the beta testing phase, but even so, it's possible for certain ones to skirt their way into the public release. But in my experience that's not too common apps usually work just fine.If there's one reason to be hesitant about iOS 15, it's the fact that there may be some lingering bugs. Most of them will work, but sometimes even once you have the app installed on your it still won't run correctly. This method should at least allow you to have most apps on your outdated device. You'll get a message that says 'The current version requires iOS 6.1 or later, but you can download the last compatible version,' just hit Download. If the iTunes on the computer and your iPad are both signed into the same Apple ID, and the iPad is connected to the internet, then go on your iPad/iPhone to App Store -> Purchased -> tap on an individual app you want to install. Then go to the iTunes store and download all the apps you want to be on your iPad/iPhone. Go onto your computer (it doesn't matter if it's a PC or a Mac) and open the iTunes app.

On your old iPhone/iPad, go to Settings -> Store -> set Apps to Off. Here's the easiest way to download apps onto an old iPhone/iPad that doesn't support downloading apps through the App Store (if you're getting an error that you need a greater software version to download):

The only workaround for now is to install a precedent version of iTunes (see this answer) and follow the rest of this answer. Now that iTunes can not manage Apps, you’re not able to side load them over USB. ITunes 12.7 or later makes this answer into a no - you can’t do it.

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