The Finder may report that those installers can’t be verified and may have been corrupted or tampered with during download.Īpple has now re-signed and re-released older installers, giving them a new expiration date of 14 April 2029-nearly 10 years in the future. The people who are being impacted are Apple consultants and IT admins who have built troubleshooting toolkits that contain a selection of macOS installers for rebuilding Macs with whatever version of macOS is required. That has happened again, since many, if not all of Apple’s recent installers had an expiration date of 24 October 2019, which came and went last week.įor most Mac users, this kerfuffle is largely irrelevant-if you need an installer for an older version of macOS, you’ll get one that will work when you download it. On his Der Flounder blog, Rich Trouton explains what happens when these certificates expire-Apple reissues the installers with new certificates. That’s sensible, but there’s a gotcha: the certificates Apple uses to sign these installers have expiration dates. Redownload Archived macOS Installers to Address Expired CertificatesĪpple digitally signs the installers used by its software updates to ensure that they haven’t been tampered with. #1683: New M3 chips in updated MacBook Pros and iMac, record Apple Q4 profits on lower revenues, no more 27-inch iMacs.#1684: OS bug fix releases, Finder tag poll results, Messages identity verification, blocking spambots, which Apple services do you use?.#1685: Hidden secrets of the Fn key, Emergency SOS via satellite free access extended, RCS support in Messages, Rogue Amoeba icon evolution.#1686: Please support TidBITS, OS security updates, Apple services poll results, biking with an iPhone. #1687: Feature-rich OS updates, recovering from a crashing bug in Contacts, Zoom for Apple TV, how much do you use widgets?.To ensure that everything goes smoothly, we'll take the extra step of deleting your existing partition before installing macOS. Once your installation files have been copied, it's time to install macOS from scratch. Once you hit Enter, you'll need to enter your admin password to approve the command, and then hit "Y" on your keyboard to confirm that you're OK with the contents of the USB drive being overwritten. Here's another example that creates a macOS High Sierra install USB on a drive named "MacOS Installer": sudo /Applications/ Install\ macOS\ High\ Sierra.app/ Contents/Resources/createinstallmedia -volume /Volumes/MacOS\ InstallerĬommand to list all connected volumes, which will include your USB installation medium in case you need to check the label. For example, "Install macOS High Sierra.app" would become Install\ macOS\ High\ Sierra.app Be aware that any spaces will need to be preceded by a backslash. You can change various parts of this command to suit your own circumstances, with the main one being the name of the installer. Sudo /Applications/ Install\ macOS\ Big\ Sur.app/ Contents/Resources/createinstallmedia -volume /Volumes/macos_installer You can find out which Mac you have by clicking on the Apple logo in the top-left corner and selecting "About This Mac" to see the name and year of release. If you're not sure what your Mac came with, head to Apple Support and search for your exact model. Your Mac's "earliest" supported version of macOS is the one that it came with. Older versions were written for Intel chips, which use the x86_64 instruction set, while the newer Apple Silicon chips use the ARM instruction set. It's common knowledge that new macOS releases often drop support for older hardware, but the same is true for newer Mac models and older software, too.įor example, you cannot install any version of macOS prior to Big Sur (released in 2020) on a Mac with an Apple Silicon chip, including the M1. It's important to understand that not all versions of macOS (or Mac OS X) work with all hardware configurations. While the process is pretty straightforward, getting your hands on older releases of macOS isn't so easy.
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