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. 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. It will also be used to reformat your Mac in case of worries.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. You now have a bootable USB stick that can install MacOS X Lion on your various Mac machines. The computer will then restart on your bootable USB stick. There, select your USB stick and then do Restart. To proceed with the installation of Lion, open the System preferences then click the icon Start-up. Wait about 10 minutes to complete the operation. In the field Destination, drag and drop your USB stick from the list on the left.Īll you have to do is click on the button Restore. then enter the file InstallESD.dmg previously copied on the Bureau. Screenshot - Creating Mac OS X Lion USB Drive

Select your USB stick and click on the button Restore on the right side. It then appears in the list on the left that lists all internal or external partitions. Search for the Disk Utility via Spotlight then insert your USB stick with a minimum capacity of 8 GB. Screenshot - Copy of image file from Mac OS X Lion Open the folder now Content then SharedSupport.Ĭopy InstallESD.dmg on your Office for ease. Screenshot - Displaying the contents of the Mac OS X Lion Installation Package So right click on it and then Show package content.

Screenshot - Applications Directory, Installation of Mac OS X Lion

That’s done, a file named Installation Mac OS X Lion appears in your folder Applications. The first thing to do is pay EUR 23.99 from the App Store to be able to download the OS. Although a USB flash drive version will be available in August for EUR 59 - double the price of the downloadable version, now create a bootable version on USB drive to protect your Lion. MacOS X Lion 10.7 is only available for download from Apple’s App Store.

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