![]() ![]() ![]() Known Issues: When using Qio 1.5.0, you may need to start your computer from. There might be old copies of Lion, Mountain Lion, and even Snow Leopard for sale on sites like eBay. 0 includes an improved, signed uninstaller compatible with macOS 10.12 (Sierra). The reasoning is starting with High Sierra HFS Plus is automatically formatted on SSD and thumb drives. 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 a Mac is already running 10.12, and it is older than 10.12, you must format a separate GUID HFS Plus partition to install 10.11 or earlier on it. If you have a valid Apple Developer account, you might be able to download older versions from /downloads. Do you need to downgrade or upgrade macOS on your Mac This page will show you the oldest. This will put an installation app in your Applications folder, which you should leave there. Once any of these downloads are complete, mount the. ![]() Leave the installation app in your Applications folder.ĭirect Disk Image Links for Older macOS Downloads 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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