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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.
Get connected
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.
Begin installation
After installation of the installer is complete, open the Applications folder on your Mac, then double-click the file named Install macOS Sierra.
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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.
New Mac Os Catalina Download
Allow installation to complete
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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.
Learn more
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.
I have looked for a while now. I have found a download page here:
The latest date on anything I can find here is from 2015.
Another page directs me to use the boot camp assistant, but it requires that I have a thumb drive (ready to be reformatted), and I must reboot into MacOS I'm not going to do that. In anticipation to some responses, we can argue about it if you want but it'll be a waste of energy.
Blu ray player for macbook pro. Many other situations would involve going to a web page and downloading an installer so I'm asking here for what I'm missing.
Thank you for responses that stick to the point and answer the question.
I felt like showing a bit more of the process:
1) 'install Windows on a Mac with Boot Camp Assistant' https://support.apple.com/en-us/HT201468
Ok this looks useful but the process is written for a fresh format and install of Windows.
Here's a link for:
2) 'If the Boot Camp Installer Doesn't Open..' https://support.apple.com/en-us/HT208495
Ok that's cool now I know I'm looking for some 'Boot Camp Installer' that needs to run on my Windows side
3) But of course there's no link to a 'Boot Camp Installer' I needed to use the Assistant from the MacOS side and the thumb drive.
4) Wait wait, here's a section called 'If you can't download or save the Windows support software:'
Oh, but this section just troubleshoots problems you have with formatting your USB drive and with USB drive recommendations.
I don't know why it's like this. Any other system would just have an installer and even an update agent for download. Is apple protecting IP and software licenses. Possible. Are they keeping users from downloading the wrong versions of stuff? Possible but there are other ways to do that.
They made a choice to handhold users through disk formatting instead of just having a download.