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. 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. I understand you are trying to download and install macOS Sierra on your MacBook Pro, but after several attempts, the application wont install. Some Internet recovery images likewise have not been updated. Click the Apple logo in the top-left corner of your screen. Once the update is finished downloading, click Download and Restart. Wait for your computer to find the update and click Update Now. Then go to System Preferences > Software Update. 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. To update an older Mac, click the Apple logo in the top-left corner of your screen. 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. 4 - Mac device won’t launch after macOS Sierra was installed. If this doesnt fix your problem, you can erase the boot drive and perform a fresh reinstall. 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. Why macOS Sierra won't install Let’s start with an outline of each of these issues of macOS Sierra installation stuck below: 1 - There is not enough disk space for macOS Sierra. Use Recovery Mode to reinstall macOS without erasing your boot drive. 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.
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