CAN I STILL INSTALL OS 10.11 INSTALL
Those who have created any bootable install disks for OS X will need to recreate them with the new installers. The new installers are signed with a certificate that expires on 7 February 2023, so it will be quite a few years before Mac users are affected again. Scroll down to the OS X installer you want and click Download. Enter your App Store password if prompted.
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.