![]() ![]() So they are expired so we need to find away around that with your Lion install (the version of Sierra I linked to above has a newer certificate). Click the pop-up menu next to your user name to see the permissions settings. Click the arrow next to Sharing & Permissions to expand the section. On your Mac, select the item, then choose File > Get Info, or press Command-I. We still have one more issue! Apple has long since stopped maintaining the installer certificates. If you don’t have permission to open a file or folder, you may be able to change the permissions settings. Or, you’ll need to prep up a OS installer USB Thumb drive using another Mac system following this guide: How to make a bootable Lion install disc or drive If you really need to stick with Lion you’ll need to get the original install CD and a CD player which works with your system. The standout is the 2012 Mac Pro, which can‘t install macOS 10.15. Use it to install the OS on your MacBook Air.īut you’ll need to worry about some of your older apps won’t run under Sierra or newer macOS’s. The newest MacBook Pro, MacBook Air, iMac or Mac mini that can‘t upgrade debuted in 2011. You need to install a newer version of OS-X (macOS) I would recommend going with Sierra (10.12.x) and stopping there.ĭownload this OS installer How to upgrade to macOS Sierra on another Mac system and follow this guide: How to create a bootable macOS Sierra installer drive.
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