It means you won't be able to create a Sierra install disk if you are still running Mac OS X 10.7 Lion or OS X 10.8 Mountain Lion. Good bye big.
You can upgrade to macOS Sierra from OS X Lion or later on any of the following Mac models. Your Mac also needs at least 2GB of memory and 8.8GB of available storage space.
MacBook introduced in late 2009 or later
MacBook Air introduced in late 2010 or later
MacBook Pro introduced in mid 2010 or later
Mac mini introduced in mid 2010 or later
iMac introduced in late 2009 or later
Mac Pro introduced in mid 2010 or later
To find your Mac model, memory, storage space, and macOS version, choose About This Mac from the Apple menu . If your Mac isn't compatible with macOS Sierra, the installer will let you know.
Make a backup
Before installing any upgrade, it’s a good idea to back up your Mac. Time Machine makes it simple, and other backup methods are also available. Learn how to back up your Mac.
It takes time to download and install macOS, so make sure that you have a reliable Internet connection. If you're using a Mac notebook computer, plug it into AC power.
Download macOS Sierra
For the strongest security and latest features, find out whether you can upgrade to macOS Catalina, the latest version of the Mac operating system.
If you still need macOS Sierra, use this link: Download macOS Sierra. A file named InstallOS.dmg will download to your Mac.
Install the macOS installer
Double-click the downloaded file to open a window showing its contents. Then double-click the file within, named InstallOS.pkg.
Follow the onscreen instructions, which will guide you through the steps necessary to install.
After installation of the installer is complete, open the Applications folder on your Mac, then double-click the file named Install macOS Sierra.
Click Continue and follow the onscreen instructions. You might find it easiest to begin installation in the evening so that it can complete overnight, if needed.
Allow installation to complete
Please allow installation to complete without putting your Mac to sleep or closing its lid. Your Mac might restart, show a progress bar, or show a blank screen several times as it installs both macOS and related updates to your Mac firmware.
- If you have hardware or software that isn't compatible with macOS Sierra, you might be able to install the previous version, OS X El Capitan.
- macOS Sierra won't install on top of a later version of macOS, but you can erase your disk first or install on another disk.
- You can use macOS Recovery to reinstall macOS.
Creating a bootable disc for OS X is as easy as using a tool like DiskMaker X. This application allows us to mount a boot unit for Mac from the operating system's installation program that you can download from the App Store.
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How does DiskMaker X work on Mac?
It's easy: you've only got to run the application for it to take care of locating the installation program thanks to Spotlight. Then it will propose the creation of the bootable disc on a USB pendrive or any other unit available without the user having to worry about anything.
The easiest way to create an OS X installer in just a few clicks.
Once created, you can use the installation unit to reinstall the operating system on another hard drive or to do so on as many computers as you want, without needing to download it once again.
What OS X versions are compatible with DiskMaker X?
This tool is compatible with the following versions of Apple's desktop operating system:
- OS X 10.14 Mojave.
- OS X 10.13 High Sierra.
- OS X 10.12 Sierra.
- OS X 10.11 El Capitan.
- OS X 10.10 Yosemite.
- OS X 10.9 Mavericks.
- OS X 10.8 Mountain Lion.
- OS X 10.7 Lion.
- Requires Mac OS X 10.7 or above.