These installers have names like Install OS X El Capitan and Install OS X Yosemite.
Delete any old OS X installers in the Applications folder or in other locations (be sure to look on external hard drives too if the App Store detects an old installer, it won’t let you get a new one). Happily, this is an easy problem to fix ahead of time: 
But if youĭownloaded an OS X installer in case of trouble, you may be in for a surprise the next time you try to use it. Most affected apps have already been updated with the new certificate.
This certificate expired on 14 February 2016, causing error dialogs and preventing some apps from launching. When used to sign an app, the certificate enables OS X to confirm that the app has not been corrupted or modified by an attacker. The Apple Worldwide Developer Relations Intermediate Certificate is required for all apps in the Mac App Store, including OS X installers.
#1660: OS updates for sports and security, Drobo in bankruptcy, why TidBITS doesn't cover rumorsįile this one under “Obscure problems that could ruin your day.” TidBITS reader Randy Singer alerted us that due to an expired certificate, OS X installers downloaded prior to 14 February 2016 won’t work. #1661: Mimestream app for Gmail, auto-post WordPress headlines to Twitter and Mastodon, My Photo Stream shutting down. #1662: New Macs, 12 top OS features for 2023, vertical tabs in Web browsers, watchOS 9.5.1. #1663: Exploring the Apple Vision Pro, 12 more OS features coming in 2023, new Apple service features, Apollo shuts down. #1664: Real system requirements for OS 2023, beware Siri creating alarms instead of timers.
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