![]() 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. 1647: Focus-caused notification issues, site-specific browser examples, virtualizing Windows on M-series Macsįile 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. ![]()
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