![]() Should a problem occur with macOS during a restart, perhaps because a storage space on the SSD is defective and thus a system component is no longer intact, this will be recognised by the startup process since the seal will now be invalid. So macOS itself cannot be changed by any software that you install as a user. And snapshots cannot be changed, even by the system itself. For further security, these Macs also do not start directly from the system volume, but from a snapshot of the system. This seal is stored either in the T2 chip of the newer Intel Macs or in the Secure Enclave of the Apple M1/M2.Įach component of the system is signed in hierarchical order, and any change to a component would also invalidate the seal that represents the top level. Since macOS Big Sur, macOS has its home on its own volume, which is both read-only and cryptographically signed and sealed (referred to as a Sealed System Volume). ![]() There might be old copies of Lion, Mountain Lion, and even Snow Leopard for sale on sites like eBay.In the past it was helpful to reinstall the system if you wanted to correct some Mac problems, but today this solution doesn’t make as much sense. Non-developers can buy OS X Mountain Lion ($19.99) and OS X Lion ($19.99) from Apple directly. Apple will email you an unlock code, which you can redeem in the Mac App Store. ![]() If you have a valid Apple Developer account, you might be able to download older versions from /downloads. This will put an installation app in your Applications folder, which you should leave there. ![]() Once any of these downloads are complete, mount the. Leave the installation app in your Applications folder.ĭirect Disk Image Links for Older macOS Downloads Once any of these downloads finishes, do not open the installer to begin the installation. Mac App Store Links for Older macOS Downloads ![]()
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