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Click Choose a macOS installer. Browse your Mac to find the macOS installer in Applications. Click Create Installer and wait for Disk Creator to finish. Installing an old version of macOS from a USB drive. When you’ve created a bootable USB drive, you can use it to install macOS from. To that, you need to select it when your Mac. Jul 03, 2020 Help! Im trying to install it on a mac pro 3,1 the creation of the usb installer went all ok without errors but after boot I get the message (This copy of install macOS Catalina application is damaged, and can’t be used to install macOS. Btw I had previously installed it in the same machine with the same method. Hi, I am running ElCap and I need to install Mavericks in a separate partition in order to run apps which are incompatible with ElCap. However, each time I start up Mac OS X 10.9 Installer I get a message that says 'This copy of Install OS application is too old to be opened on this version of. Step 2b: Get the install file for an older version of macOS. For older versions of macOS and Mac OS X it's a bit more difficult to get the install file: Apple doesn't offer downloads of outdated. Remember, the MacOS Mojave Installer application deletes itself automatically after macOS Mojave has successfully installed, thus even if you previously downloaded the installer and used it to install Mojave on the same Mac, unless you previously had made a copy of it then it will have removed itself, thus you’d need to re-download it again.

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Rachel is trying to sell her Mac, but…

My friend was wiping my Mac so I could sell it and I’m pretty sure they’ve deleted the start up disk? It’s not letting me reinstall the OS on a recovery startup.

She wonders about a fix. There are a couple of options with an erased partition.

Because Recovery didn’t work, the fastest way to install fresh is to make or borrow a macOS installer on a USB flash drive or a disk drive. We have instructions for making a bootable installer with macOS Sierra (as well as archived versions for several previous releases). You need at least an 8GB flash drive. The article includes instructions on obtaining the installer, which might involve you having to use someone’s else Mac to download it, if you don’t have a replacement Mac on hand yet.

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But if you can’t get access to another Mac or the necessary drive, it’s still possible to use a different Recovery mode on all recent Macs, dating back to 2010. Normally, you can start up a Mac while holding down Command-R to boot into what Apple now calls macOS Recovery. That allows you to run Disk Utility, reinstall or wipe and install the system, access Terminal for command-line functions, and so on. In that mode, when you choose to reinstall without erasing the drive, my recollection is that Recovery looks for the current OS system installer on your startup disk in the Applications folder, and uses that. (Apple doesn’t document that, and I haven’t had to test that for years.)

Failing finding it, Recovery downloads the currently installed version of macOS (or OS X), which is about 5GB. When complete, it installs it and reboots, and places the installer in the Applications folder.

However, there’s yet another option: macOS Recovery over the Internet, which requires either a Mac model released in 2012 or later, or most 2010 and 2011 models with a firmware upgrade applied. There, the Mac reaches out over a Wi-Fi or ethernet connection to download the relatively modest Recovery software, which then bootstraps the download of the full macOS installer.

Apple says Internet-based Recovery should happen automatically on supported models, and you should see a spinning globe when that mode is invoked while the download occurs. However, if you have normal Recovery installed and it refuses to install macOS for some reason, you can manually invoke Internet Recovery.

While Command-R at startup always installs whatever the most recent version you installed on your Mac, holding down Command-Option-R brings down the very latest compatible version that can be installed. Apple also offers Shift-Command-Option-R, which installs the version of OS X or macOS with which your computer shipped, or the next oldest compatible system still available for download.

(Apple just changed this behavior with 10.12.4, but if you’re using Internet Recovery for a clean install on an erased drive, the new behavior should be active as it will be pulled from the version of Recovery that’s bootstrapped from Apple’s servers. The pre-10.12.4 option is simply Command-Option-R, but it acts like the new Shift-Command-Option-R, installing the shipped OS or the oldest compatible version.)

Apple recommends the Command-Option-R option as the only safe way to reinstall a Mac with El Capitan or earlier versions of macOS if you want to be sure your Apple ID doesn’t persist even after erasure.

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