![]() And if you're just doing an upgrade install rather than a clean install, you can run the Catalina installer from the USB drive from within your current installation of macOS, no advanced tweaking required. To re-enable this feature, hold down Command-R while your Mac reboots to go into Recovery Mode and use the Startup Security Utility to 'allow booting from external media.' If you're trying to install an older version of macOS, you may also need to go from Full Security to Medium Security to enable booting, but if you're just trying to install the current version of macOS, the Full Security option should be just fine. ![]() Among this chip's many security features is one that disallows booting from external drives by default. Whats needed for a clean install on a Mac. There's also one new consideration for newer Macs with Apple's T2 controller chip-as of this writing, that list includes the iMac Pro, the 2018 Mac Mini, the 2018 MacBook Air, and 20 MacBook Pros, though Apple keeps an updated list here. Make a Bootable USB macOS Installer Download the update for Big Sur compatibility. ![]() There are other apps out there that do this, but this one is quick and simple. If you want a GUI, take a look at Ben Slaney's Install Disk Creator from MacDaddy.Install Disk Creator for Mac lies within System Tools, more precisely General. If you want a GUI, were recommending a different app than last yeartake a look at Ben Slaneys Install Disk Creator from MacDaddy. ![]() The installer will delete itself when you install the operating system, but it can be re-downloaded if necessary. This free Mac app is an intellectual property of MacDaddy. The macOS 10.12 Sierra installer from the Mac App Store in your Applications folder. We cannot confirm if there is a free download of this app available. The installer will delete itself when you install the operating system, but it can be re-downloaded if necessary. The 1.21 version of Install Disk Creator for Mac was available to download on the developer's website when we last checked.
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