There might be old copies of Lion, Mountain Lion, and even Snow Leopard for sale on sites like eBay. Non-developers can buy OS X Mountain Lion ($19.99) and OS X Lion ($19.99) from Apple directly. Apple will email you an unlock code, which you can redeem in the Mac App Store. If you have a valid Apple Developer account, you might be able to download older versions from /downloads. This will put an installation app in your Applications folder, which you should leave there. Download the macOS Catalina installation file using this link Turn off the Mac and then insert the bootable USB drive Now turn the Mac back on while holding the Option key It will take you to the boot menu where you can select the USB drive. Once any of these downloads are complete, mount the. Format your USB drive as Mac OS Extended (Journaled) and choose the GUID Partition Map scheme. First, right-click the USB drive in Disk Utility and click Erase. Leave the installation app in your Applications folder.ĭirect Disk Image Links for Older macOS Downloads How to Install macOS on a USB Drive You’ll want to use the Disk Utility app for this method. Once any of these downloads finishes, do not open the installer to begin the installation. Mac App Store Links for Older macOS Downloads
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