Avast One is an all-in-one security and optimization tool that helps block viruses, spyware, and other malicious threats. Additionally, it helps protect you and your data from hackers while you are online and improves the performance of your system.

Avast One is available as both a free and paid app. This article explains how to install the free version of Avast One, then optionally upgrade to the paid version.

Install Avast One

1. Click the button below to download the Avast One setup file, and save it to a familiar location on your Mac (by default, downloaded files are saved to your Downloads folder).
   Download Avast One for Mac
2. Double-click the downloaded setup file avast_one_online.dmg.
3. Double-click the Avast One icon.
4. In the new window, click Allow/Continue.
5. Click Continue to confirm that you accept the Avast Privacy Policy.
6. Click Continue to confirm that you have read the End User License Agreement, then click Agree to confirm that you accept the terms.
7. Click Install to proceed with default installation. Alternatively, click Change Install Location... if you want to make changes to the default setup.
8. Enter the password that you use when you start your Mac, then click Install Software. If prompted, enter this password again, and click Update Settings.
9. When the System Extension Blocked notification appears, click OK.
10. Click Close ▸ Move to Bin.
11. If prompted, click OK to allow the Avast One installer to access your downloads folder.
12. Click Continue.
13. Select your preferred option below:
    • Sign in: if you already have an Avast Account, sign in to Avast One with your existing account.
    • Continue without an account: continue without linking Avast One to an Avast Account.
    
14. Click Open, then follow the on-screen instructions to allow permissions for Avast One. For detailed instructions, refer to the following article:
    • Allowing all permissions on macOS
    
15. Click Got it.

The free version of Avast One is now installed on your Mac and the application Home screen opens automatically.

Upgrade to the paid version of Avast One

You can subscribe to the paid version of Avast One by clicking Go premium in the top-right corner of the application screen. Follow the on-screen instructions to complete the transaction.

The application activates automatically. If you already subscribed to the paid version of Avast One before installation, you need to manually activate the app. For instructions, refer to the following article:

• Activating Avast One

Still need help?

If you experience any installation issues:

1. Ensure your Mac meets the minimum system requirements:
   • Apple macOS 14.x (Sonoma), Apple macOS 13.x (Ventura), Apple macOS 12.x (Monterey), Apple macOS 11.x (Big Sur), Apple macOS 10.15.x (Catalina), Apple macOS 10.14.x (Mojave), Apple macOS.x 10.13.x (High Sierra)
   • Intel based Mac with 64-bit processor or Apple silicon chip (M1)
   • 512 MB RAM or above (1 GB RAM or higher preferred)
   • 750 MB free space on the hard disk
   • Internet connection to download, activate, and maintain application updates and the antivirus database
   • Optimally standard screen resolution no less than 1024 x 768 pixels
2. Uninstall any applications from your Mac that are incompatible with Avast One. For more information, refer to the following article:
   • Avast One - FAQs
3. Restart your Mac, then try to install Avast One again by following the exact steps in this article.

If the issue persists, contact Avast Support.

Further recommendations

For more information about Avast One, refer to the following article:

• Avast One - FAQs

For instructions on how to use Avast One, refer to the following article:

• Avast One - Getting Started