Apple Software Update Certification Authority Here’s the output for the Yosemite installer: pkgutil -check-signature /Volumes/Install\ OS\ X/InstallMacOSX.pkg The command is for any signed package, not just Apple OS installers. Run this in Terminal: pkgutil -check-signature /path/to/installer.pkg. I’ll add that if your computer is too new to run a particular OS installer, you can still check if the package certificate is valid, not expired. Apple is unlikely to exist forever, but will the final employee re-sign all the old installers with a certificate that expires on the last possible date of 31 December 9999? And then what happens in the year 10,000? Expiring certificates could make it difficult or even impossible to bring older Macs back to life for historical or reference purposes. Silicon Valley always wants to look to the future, but academics and researchers of that future will also want to look back. Although it’s mostly just an annoyance to redownload everything now, the situation is more troubling over the long term. This 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. Softwareupdate -fetch-full-installer -full-installer-version 10.13.6 In the Year 2525 This command downloads the latest Install macOS application to your Applications folder.Īnd this one downloads 10.13.6 specifically. This seems to work with versions of 10.14 Mojave and 10.13 High Sierra, but nothing older. Speaking 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.
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