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To get the latest features and maintain the security, stability, compatibility, and performance of your Mac, it's important to keep your software up to date. Apple recommends that you always use the latest macOS that is compatible with your Mac.
Learn how to upgrade to macOS Big Sur, the latest version of macOS.
Check compatibility
If a macOS installer can't be used on your Mac, the installer will let you know. For example, it might say that it's too old to be opened on this version of macOS, or that your Mac doesn't have enough free storage space for the installation.
Buy Yosemite Os X
To confirm compatibility before downloading, check the minimum requirements for macOS Catalina, Mojave, High Sierra, Sierra, El Capitan, or Yosemite. You can also find compatibility information on the product-ID page for MacBook Pro, MacBook Air, MacBook, iMac, Mac mini, or Mac Pro.
Make a backup
Before installing, 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.
Download macOS
It takes time to download and install macOS, so make sure that you're plugged into AC power and have a reliable internet connection.
Safari uses these links to find the old installers in the App Store. After downloading from the App Store, the installer opens automatically.
- macOS Catalina 10.15 can upgrade Mojave, High Sierra, Sierra, El Capitan, Yosemite, Mavericks
- macOS Mojave 10.14 can upgrade High Sierra, Sierra, El Capitan, Yosemite, Mavericks, Mountain Lion
- macOS High Sierra 10.13 can upgrade Sierra, El Capitan, Yosemite, Mavericks, Mountain Lion
Safari downloads the following older installers as a disk image named InstallOS.dmg or InstallMacOSX.dmg. Open the disk image, then open the .pkg installer inside the disk image. It installs an app named Install [Version Name]. Open that app from your Applications folder to begin installing the operating system.
- macOS Sierra 10.12 can upgrade El Capitan, Yosemite, Mavericks, Mountain Lion, or Lion
- OS X El Capitan 10.11 can upgrade Yosemite, Mavericks, Mountain Lion, Lion, or Snow Leopard
- OS X Yosemite 10.10can upgrade Mavericks, Mountain Lion, Lion, or Snow Leopard
Install macOS
Follow the onscreen instructions in the installer. It might be easiest to begin installation in the evening so that it can complete overnight, if needed.
If the installer asks for permission to install a helper tool, enter the administrator name and password that you use to log in to your Mac, then click Add Helper.
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 macOS and related firmware updates.
Learn more
You might also be able to use macOS Recovery to reinstall the macOS you're using now, upgrade to the latest compatible macOS, or install the macOS that came with your Mac.
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Clean Installing OS X Yosemite | The three steps to clean installing OS X Yosemite
Take a screencap. Do you want a brand new start on your Mac with no apps or files? A clean install of OS X Yosemite is just the thing for you. Now, there are three things you're going to want to do in order to perform a clean install: clean up your Mac (which is a quick, easy task with CleanMyMac X), back it up with Time Machine, and then install a fresh copy of OS X Yosemite.
We'll go over all three steps below. So, let's start with number one — Cleaning up your Mac.
Step 1: Clean up your Mac
So listen, you're definitely going to want to do a backup of your Mac in case something goes wrong. To make that process easier, you should first clean up your Mac. It may sound like a daunting task, however, there are tools that can help you out, like CleanMyMac. Cleaning up your Mac with CleanMyMac X will save you time and the stress of cleaning it up yourself. Download CleanMyMac X and follow the steps below before backing up your Mac:
- Launch CleanMyMac X.
- Click Scan.
- After it's done scanning, click Run.
And that's all it takes to do basic Mac cleanup with CleanMyMac X. If you'd like to clean up more junk on your Mac, check out the sections on the left side of the app. It will help you take care of tons of other cleanup items. Macos default admin password. After you're done cleaning the junk off your Mac, it's time for the next step.
Step 2: Back up your Mac
Backing up is just good practice. If something goes wrong, you don't want to be left stranded without a backup of your Mac. Now, if you don't wish to back up your Mac, you can proceed to step three. But remember, if you don't have a backup and something goes wrong, you won't be able to recover or restore anything from your current Mac. With that said, here are the steps for backing up your Mac:
- Go to your Applications folder and click Time Machine.
- Click on 'Select Disk.'
- Select the external drive you wish to save your backup. An Apple Time Capsule is the ideal place to save it to. If you don't have one, choose a different external drive.
- Click 'On' to turn Time Machine on; the button is located on the left-hand side of the menu.
- To the right, below the name of the storage device, you'll find, 'Oldest backup,' 'Latest backup,' and 'Next backup.' Your backup should start within the next 5 minutes.
We'll go over all three steps below. So, let's start with number one — Cleaning up your Mac.
Step 1: Clean up your Mac
So listen, you're definitely going to want to do a backup of your Mac in case something goes wrong. To make that process easier, you should first clean up your Mac. It may sound like a daunting task, however, there are tools that can help you out, like CleanMyMac. Cleaning up your Mac with CleanMyMac X will save you time and the stress of cleaning it up yourself. Download CleanMyMac X and follow the steps below before backing up your Mac:
- Launch CleanMyMac X.
- Click Scan.
- After it's done scanning, click Run.
And that's all it takes to do basic Mac cleanup with CleanMyMac X. If you'd like to clean up more junk on your Mac, check out the sections on the left side of the app. It will help you take care of tons of other cleanup items. Macos default admin password. After you're done cleaning the junk off your Mac, it's time for the next step.
Step 2: Back up your Mac
Backing up is just good practice. If something goes wrong, you don't want to be left stranded without a backup of your Mac. Now, if you don't wish to back up your Mac, you can proceed to step three. But remember, if you don't have a backup and something goes wrong, you won't be able to recover or restore anything from your current Mac. With that said, here are the steps for backing up your Mac:
- Go to your Applications folder and click Time Machine.
- Click on 'Select Disk.'
- Select the external drive you wish to save your backup. An Apple Time Capsule is the ideal place to save it to. If you don't have one, choose a different external drive.
- Click 'On' to turn Time Machine on; the button is located on the left-hand side of the menu.
- To the right, below the name of the storage device, you'll find, 'Oldest backup,' 'Latest backup,' and 'Next backup.' Your backup should start within the next 5 minutes.
Pokemon home screen. Once you're done backing up your Mac, head to the next section.
Step 3: Clean Install OS X Yosemite
It's time for a clean install. We're going to show you how to do it without using a USB drive, which makes it much easier and less confusing. So to start, you should download OS X Yosemite from the Mac App Store. Once it's finished downloading, it'll immediately load up on your screen. Follow the instructions to install OS X Yosemite. Once it's done, it'll ask you to restart your Mac. Do it, and once it's loaded up, we'll start the clean install process:
- We're going to restart your Mac again. But this time, hold down Cmd+R. (Keep holding it down while it restarts, do not let go!)
- Now, your Mac should load a screen with a few options (you can let go of Cmd+R now).
- Select the Disk Utility option.
- In the window, at the top of the left bar, select your Mac's Main Drive. It should be something like MainHD.
- Now, select the Erase tab, located next to the First Aid button at the top-center.
- Near the center of the window, select the Format drop-down list and select 'Mac OS X Extended (Journaled)' as the type.
- Click Erase (this will erase your main drive!) and allow some time for the drive to format.
- When it's finished, close out Disk Utility and select 'ReInstall OS X' from the menu. It will ask for your Mac App Store password to redownload OS X Yosemite. Give it a minute to do so.
- A new window should pop up and OS X Yosemite should begin to install. If it does not, press back and enter your password again.
- Once again, follow the install instructions and enjoy your newly clean-installed OS X Yosemite.