If the download completes successfully but the installation doesn’t finish, force quit the installer using the same procedure as above. MacOS High Sierra won’t install. Re-launch the App Store and try downloading again.#1581: New Safari 15 features, Center Stage vs. Uninstall previous versions of Cisco AnyConnect and install version. Find macOS High Sierra and click Install.Before you upgrade to macOS Big Sur, run LiveUpdate and install all the available.
![]() 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.The Finder may report that those installers can’t be verified and may have been corrupted or tampered with during download.Apple 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. 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.For 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. #1577: iPhone 12/12 Pro repair program, fix corrupted Chrome extensions, iCloud Mail custom domains, Chipolo AirTag alternative, 10-digit dialing changesRedownload Archived macOS Installers to Address Expired CertificatesApple digitally signs the installers used by its software updates to ensure that they haven’t been tampered with. To change the date from Terminal (which is likely all that will be accessible), follow these steps, which set it to 1 February 2016: Before you install, set the clock on the Mac to a date when the certificate was valid, perform the install, and then reset the date back after installation. Historically, they appeared in the App Store app, in your list of purchased items, but the only operating systems still showing up there for me are the developer beta of Sierra and the GM candidate for El Capitan (and I doubt they’d work anyway).However, if you have installers for 10.9 Mavericks, 10.8 Mountain Lion, and 10.7 Lion, TidBITS Talk reader gastropod suggested a workaround for their expired certificates. Doctor cleaner para macThis seems to work with versions of 10.14 Mojave and 10.13 High Sierra, but nothing older.This command downloads the latest Install macOS application to your Applications folder.And this one downloads 10.13.6 specifically.Softwareupdate -fetch-full-installer -full-installer-version 10.13.6 In the Year 2525This isn’t the first time we’ve needed to rebuild our collections of macOS installers—see “ Previously Downloaded OS X Installers No Longer Work” (2 March 2016)—and it won’t be the last. Quit Terminal and continue the install.Catalina Enhances softwareupdate Command-Line ToolSpeaking of Terminal, Armin Briegel has written on his Scripting OS X blog that the softwareupdate command has a new option in Catalina that lets you download the full installer for a specific version of macOS. Enter sudo date 0201010116, press Return, and enter your password. ![]() All of them worked for me except High Sierra, which required me to download DosDude1’s macOS High Sierra Patcher Tool for Unsupported Macs. This is a useful community service. Apple Software Update Certification AuthoritySHA1 fingerprint: E3 30 E5 04 00 4B D2 5C 45 80 0A F2 D5 1B 03 D5 77 27 B7 01SHA1 fingerprint: 61 1E 5B 66 2C 59 3A 08 FF 58 D1 4A E2 24 52 D1 98 DF 6C 60When I run the same command on OSInstall.mpkg from within the Mojave installer, the fingerprints are identical so that means the expiration dates are the same.Thanks for these links, Adam. ![]() Crashed On Get Copy Of Sierra For Re Archive Volume ThatOn the app store page for HS I got an Open button, even though I had unmounted my archive volume that contained the HS installer. Very worried about performance fall-off, particularly on the laptops.I got them all to download, except High Sierra. Dreading having to deal with High Sierra vagaries on three different computers. It was empty when I opened it so I threw it away. So I retained the apps for Mojave, El Capitan and Yosemite.Interestingly, the folder “HighSierraDownload” was also downloaded. The other links downloaded dmg copies, which do not contain the usual installer app. However, this was the only one, besides Mojave, that downloaded the app. So now I have updated apps for all the macOS X installers in your list. High Sierra was them downloaded to my specified location. I haven’t tried it with on OS installer, though, but it might be worth a try.Here is a method that doesn’t involve changing the system clock on the target computer, and works reliably to create a bootable SIERRA installer. This may seem trivial I mention it in case someone else runs into the same problem.By the way, I’ve gotten the out-of-date certificate message before with old Apple app installers and was able to run the installers anyway, ignoring the message. I tried trashing the HighSierraDownload folder for the second High Sierra download and it was not removed this time. They are somehow linked, I guess because the installer components were originally in the folder. So I downloaded it again before discovering that the first installer was in the trash with the HighSierraDownload folder. Next, use Apple’s current installer to put the updated version of “Install macOS Sierra” (with the valid certificate but apparently a non-working createinstallmedia) back into your Applications folder of your computer. There are a bunch of “hidden” files that will boot the USB drive. Although it will seem like the USB drive is now blank, it isn’t. Once created, open the USB drive and move the installer app “Install macOS Sierra” from the USB drive into the trash and empty trash. All of the other installers with updated certificates work properly with the createinstallmedia command. This is only necessary for the Sierra installer. It’s actually the only solution I’ve seen anywhere since this mess started, that works. Believe it or not, this WORKS.
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