Ensure you have installed the Security Update 2020-006 for High Sierra. Run the Mac App Store software update tool to grab all final security patches. iPhone Not Connecting to iTunes
This happens when a modern iPhone running a newer iOS version (like iOS 15, 16, or later) tries to talk to an older Mac. To fix this, close iTunes, connect your iPhone via USB, and open the built-in Image Capture app first. If a pop-up window asks to download an "unnamed software update," accept it. This background tool updates the mobile device connectivity pairing profile without changing your operating system.
. The error message stating "This update requires macOS version 10.13.99 or earlier" is a common technical hurdle for users trying to install iTunes on newer Macs. The Mystery of macOS 10.13.99
If you are running macOS High Sierra and looking to download or reinstall iTunes, you need the final supported version, which is .
(syncing your iPhone or iPad) was moved directly into the Finder . Understanding the "10.13.99" Error
Apple wants you to forget iTunes. But for millions of users, iTunes remains the backbone of their digital media life. If you are running macOS 10.13 (High Sierra) or a hypothetical 10.13.99 (read: the final patched version), here is why you need the standalone iTunes:
Restart your Mac and immediately hold down until the Apple logo appears. From the macOS Utilities window, select Reinstall macOS .
: Connect your device to your Mac and open a Finder window. Your device will appear in the sidebar under "Locations".
Apple maintains a legacy downloads portal. Do not use third-party “iTunes downloader” sites.
Installation & download considerations
Are you trying to (like a newer iPhone)?
You are trying to install an old iTunes file on a newer macOS. You cannot "downgrade" iTunes to sync older features on a modern Mac easily.
instead of iTunes. Simply connect your device and select it in the Finder sidebar. Apple Support Community How to Access "iTunes" Features on Modern macOS
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later.
: Click the download button for iTunes 12.8.3. The file will be in the .DMG format (a disk image). The file size for this installer is approximately 275.9 MB .
If you are looking for a download that works on “10.13.99,” you actually need the .
Ensure your Mac is fully updated to via the App Store.
If you are attempting to install a newer version of iTunes intended for macOS Mojave or Catalina, it will not work on High Sierra. You may see a message stating "iTunes cannot be opened" or "This version of macOS is not supported."
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Explore MoreEnsure you have installed the Security Update 2020-006 for High Sierra. Run the Mac App Store software update tool to grab all final security patches. iPhone Not Connecting to iTunes
This happens when a modern iPhone running a newer iOS version (like iOS 15, 16, or later) tries to talk to an older Mac. To fix this, close iTunes, connect your iPhone via USB, and open the built-in Image Capture app first. If a pop-up window asks to download an "unnamed software update," accept it. This background tool updates the mobile device connectivity pairing profile without changing your operating system.
. The error message stating "This update requires macOS version 10.13.99 or earlier" is a common technical hurdle for users trying to install iTunes on newer Macs. The Mystery of macOS 10.13.99
If you are running macOS High Sierra and looking to download or reinstall iTunes, you need the final supported version, which is .
(syncing your iPhone or iPad) was moved directly into the Finder . Understanding the "10.13.99" Error
Apple wants you to forget iTunes. But for millions of users, iTunes remains the backbone of their digital media life. If you are running macOS 10.13 (High Sierra) or a hypothetical 10.13.99 (read: the final patched version), here is why you need the standalone iTunes:
Restart your Mac and immediately hold down until the Apple logo appears. From the macOS Utilities window, select Reinstall macOS .
: Connect your device to your Mac and open a Finder window. Your device will appear in the sidebar under "Locations".
Apple maintains a legacy downloads portal. Do not use third-party “iTunes downloader” sites.
Installation & download considerations
Are you trying to (like a newer iPhone)?
You are trying to install an old iTunes file on a newer macOS. You cannot "downgrade" iTunes to sync older features on a modern Mac easily.
instead of iTunes. Simply connect your device and select it in the Finder sidebar. Apple Support Community How to Access "iTunes" Features on Modern macOS
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later.
: Click the download button for iTunes 12.8.3. The file will be in the .DMG format (a disk image). The file size for this installer is approximately 275.9 MB .
If you are looking for a download that works on “10.13.99,” you actually need the .
Ensure your Mac is fully updated to via the App Store.
If you are attempting to install a newer version of iTunes intended for macOS Mojave or Catalina, it will not work on High Sierra. You may see a message stating "iTunes cannot be opened" or "This version of macOS is not supported."
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