To completely remove all Norton application files and references on your Mac, download and run the RemoveNortonMacFiles tool.
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Download and run RemoveNortonMacFiles as an administrator
Download the RemoveNortonMacFiles.zip file.
Click the Finder icon in the Dock.
In the Finder window, click Downloads in the left pane under Favorites.
Do one of the following:
If you downloaded the file using Safari browser, open the RemoveNortonMacFiles folder.
If you downloaded the file using the Mozilla Firefox or Google Chrome browsers, double-click the RemoveNortonMacFiles.zip file to expand it, and then open the RemoveNortonMacFiles folder.
In the RemoveNortonMacFiles folder, control-click the RemoveNortonMacFiles.command file, and then click Open with > Terminal (default).
To run this tool, you must be logged on with an Administrator account and a non-blank password.
Do one of the following:
If you have not uninstalled Norton application on your macOS 10.15.x or later, a message appears in the Terminal window that prompts to drag and drop Norton from Applications folder to Trash. Go to step 7.
If you have macOS 10.14.x and earlier, OR if you already uninstalled Norton on your macOS 10.15.x or later, go to step 13.
In the Terminal window, press return to open the Applications folder in Finder.
In the Applications folder, select the Norton application, and then drag and drop it to the Trash.
When you see a prompt, type your administrator account password, and then click OK.
In the Norton installer window, click Uninstall.
If you see a prompt, type your administrator account password, and then click Install Helper.
When the Norton uninstall finishes, run the RemoveNortonMacFiles.command file in Terminal again.
For more information, refer to the instructions in step 5 above.
In the Terminal window, type your administrator password, and then press return.
When you type your password, no characters appear.
To remove all Norton files and folders, type 1.
If you want to quit RemoveNortonMacFiles without removing any files, type 2.
Press return.
RemoveNortonMacFiles tool removes all of the Norton files.
When the RemoveNortonMacFiles tool finishes removing the Norton files, in the Terminal window, type y, and press return to restart your Mac.
Before you press return, make sure that you save your work in other open applications.
RemoveNortonMacFiles removes all the folders that Norton installers created, and all the files within those folders including any that you have created.
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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.
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.
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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
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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.
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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 macOS and related firmware updates.
Learn more
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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.