Most third-party app developers have had ample time to make sure their apps work with High Sierra, so there should be no compatibility issues there. If updating macOS, iTunes, and iOS to the current versions still presents the prompt above, then you'll need to click on "Install" to download and install the supported software from Apple's servers. In some cases, installing the update required will hang and present an "installation failed" error after a decent amount of time has passed.

In that scenario, it's likely that your iPhone is running a developer beta or public beta software that is yet to be officially supported on the latest stable release of macOS. Let's say you're currently running iOS 12 developer beta 3 or iOS 12 public beta 2. If that's the case and you're currently on the latest macOS High Sierra version, this may be a problem. While Apple is usually pretty good at making sure their iOS betas are compatible with the latest stable version of macOS, sometimes they slip the ball.

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In this case, you'll need to be running the latest beta version of macOS, which, for the iOS 12 betas , would be for the macOS Mojave Either that, or you'll need to downgrade your iPhone back to the latest stable release of iOS. If you don't want to jump on the latest macOS beta but would like to stay on the iOS beta, then there's one more thing you can do — install the latest Xcode beta on your Mac. While non-developers will likely have no use for Xcode, unless wanting to sideload apps they're permitted to or needing to run certain Linux-style commands in Terminal, it may be required to get the iPhone syncing with iTunes again.

However, this is the latest stable release, not the beta version that you need. To get the latest beta version of Xcode, you just need to visit developer.

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Once you're there, simply hit "Download" next to the latest Xcode beta, in my case, that's Xcode 10 beta 3. Once it's finished downloading, you'll need to uncompress the file, so double-click on the XIP file in your "Downloads. This will unzip the archive into an application file about twice its size. In my case, it ended up being over 11 GB.

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Be patient during this process, as it may take a while to uncompress. Once it's finish, you should end up with an "Xcode-beta" app in your "Downloads. If you have a stable version of Xcode, you may want to delete that now since two apps over 10 GB may be unnecessary if you don't have enough room for them. Now, just installing the Xcode beta is not good enough.

You need to actually double-click on it. When it first opens, you'll be presented with an option to "install additional required components.

If you have iTunes open, you will need to close it before continuing. You'll see a blue progress bar moving across the screen.

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When the download is complete, a window will pop up asking whether you want to install the update now or later. To install now, tap Install Now. Your device will now begin installing the update.

First, it will verify the update with Apple's servers. A progress bar shows the status of the update.

How to Download iOS 12 on Your iPhone, iPad, and iPod Touch | Digital Trends

Do so. Share Pin Email. Sam Costello has been writing about tech since His writing has appeared in publications such as CNN. Updated September 24, Tap the Settings app on your home screen. Scroll down to General and tap on it. When the iOS update has finished installing, your iPhone will restart.

With that done, you're ready to use your iPhone, with its freshly installed new OS. Your iPhone will let you know when there's an update even if you don't check for it. If you see a little red 1 icon on the Settings app on your home screen, that means there's an iOS update available. You may also get a push notification.