The operating systems can be downloaded from the following links: DMG. Now your older OS installer thumb drives will work! Just remember to re-set the Date back to the correct year and set it back to auto. Apple has published download links for Mac OS X 10.7 Lion and Mac OS X 10.8 Mountain Lion in its support area. The trick is back dating the systems clock! Alter the Date & Time setting from auto set to manual and then alter the date to a year that is within the given OS’s release window. Not to fear! You can still install the OS.

Some Internet recovery images likewise have not been updated. In all of these just jump down to Step 4 to get to the URL link for the OS image.Īpple did not alter the older images in their downloads. The issue you face with the newer macOS’s is Apple didn’t update the certificate which is why this has become more of an issue as of late. It is also possible to download the certificate from the Control Panel. As an example I had to re-install Lion for someone as they just didn’t want anything newer (90 year old lady) who just didn’t want to relearn how to do things or have the will to update her apps. Immediately after being issued, your SSL certificate will be sent to you by email. You’re hitting an expired certificate issue! Here’s more on it If you've got an old macOS install image, it will probably stop working todayĪpple has been doing this for years! You mostly on hit this issue on systems which can’t support newer OS’s. Download Mac OS X Mountain Lion 10.

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