iTunes 12.6.3.6 was designed for iOS 11. While it can see modern devices (iPhone 15 with iOS 18), it cannot sync backups or apps reliably due to newer cryptographic protocols. Use it for app management on legacy devices or for side-loading .IPA files to older iOS versions (15 and below generally work).
While the current iteration of Apple’s ecosystem has fragmented media into separate Music, TV, and Podcasts apps, iTunes 12.6.3.6 represents the last bastion of a unified media hub that also respected the specific needs of power users, businesses, and schools. If you have ever found yourself frustrated by the inability to manage apps on your iPhone via your computer, or if you miss the days when one app did it all, this guide explains why iTunes 12.6.3.6 is the "Goldilocks" version you need. itunes 12.6.3.6
The only major reason to use this build. You can manage your home screen layouts and backup apps to your computer—perfect for saving versions of apps that might be removed from the store. Broad Device Support: iTunes 12
However, for users with offline, air-gapped devices running iOS 10 or 11, iTunes 12.6.3.6 will likely work for decades. It does not "phone home" to Apple to validate app installs. It simply moves files. While the current iteration of Apple’s ecosystem has
iTunes 12.6.3.6 is a unique "corporate" version of iTunes released by Apple to maintain the that were removed in later versions like iTunes 12.7. Key Features of 12.6.3.6