Installing Avast One

Avast One is currently available only in Australia. To install Avast Premium Security or Avast Mobile Security Premium instead, refer to the relevant article below:

Avast One is an all-in-one security and optimization tool that blocks viruses, spyware, and other malicious threats. Additionally, it protects 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 product. This article explains how to install the paid version of the app, Avast One.

Install Avast One

  1. Click the button below to download the Avast One setup file, and save it to a familiar location on your PC (by default, downloaded files are saved to your Downloads folder).
    Download Avast One
  2. Right-click the downloaded setup file avast_one_setup_online.exe and select Run as administrator from the context menu.
If you are unable to authorize installation of Avast One, refer to the following article for advice:
  1. If prompted for permission by the User Account Control dialog, click Yes.
  2. Click Install Now.
  3. Wait while setup installs Avast One on your PC.
  4. Click Get Started, then follow the on-screen instructions to complete Avast One Free installation.
  5. When installation is complete, answer the five-question survey to personalize your initial Smart Scan. To skip the survey, click Skip all.
  6. Click Start Your First Scan to start scanning for vulnerabilities on your PC.
  7. Follow the on-screen instructions to resolve each found issue. To skip ahead and explore other Avast One Free features, click Skip for now.

Avast One Free is now installed, but some components may not fully function until you restart your PC.

To activate Avast One, refer to the following article:

Troubleshooting

If you experience any installation issues:

  1. Ensure your PC meets the minimum system requirements and your Windows version is up to date.
  • Windows 10 except Mobile and IoT Edition (32 or 64-bit); Windows 8/8.1 except RT and Starter Edition (32 or 64-bit); Windows 7 Service Pack 1 with Convenient Rollup Update or later, any Edition (32 or 64-bit)
  • Windows fully compatible PC with Intel Pentium 4 / AMD Athlon 64 processor or above (must support SSE2 instructions); ARM-based devices are not supported
  • 1 GB RAM or above
  • 2 GB free space on the hard disk
  • Internet connection to download, activate, and maintain program updates and antivirus database
  • Optimally standard screen resolution no less than 1024 x 768 pixels
  1. Check that the downloaded setup file is not corrupted. For instructions, refer to the following article:
  2. Uninstall any previous antivirus software from your PC. For instructions, refer to the following articles:
  3. Restart your PC, then try to install Avast One again by following the exact steps in this article.
  4. If the issue persists, contact Avast Support and provide your setup log file. For instructions, refer to the following article:

Further recommendations

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

Avast One is an all-in-one security and optimization tool that blocks viruses and other malicious threats. Additionally, it protects you and your data online, and boosts the performance of your device.

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

Install Avast One

  1. On your Android device, tap the button below to open Google Play Store.
    Go to Google Play Store
  2. Tap Install to download and install the app. When installation is complete, tap Open.
  3. Tap Get Started.
  4. Tap Continue.
  5. Select Run Smart Scan, then wait while Avast One scans your device for vulnerabilities.
  6. Tap Resolve under each found vulnerability to begin protecting your device. Alternatively, select Ignore all issues to continue to the main Avast One screen.

Avast One is now installed on your Android device. Continue to the Upgrade Avast One section of this article to install the paid version of Avast One.

Upgrade Avast One

You can purchase an Avast One subscription by tapping Upgrade in the top-right corner of the main app screen. Follow the on-screen instructions to complete the purchase.

Your paid subscription activates automatically. If you already purchased Avast One for Android via another sales channel, you need to manually activate your subscription. For detailed activation instructions, refer to the following article:

Troubleshooting

If you experience any installation issues, ensure your Android device meets the minimum system requirements.

  • Google Android 5.0 (Lollipop, API 21) or later
  • Internet connection to download, activate, and maintain app updates

If the issue persists, contact Avast Support.

Further recommendations

To learn more about the features available in Avast One, refer to the following article:

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

Avast One is an all-in-one security and privacy tool that blocks viruses and other malicious threats. Additionally, it protects you and your data online.

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

Install Avast One

  1. On your iOS device, tap the button below to open the App Store.
    Go to the App Store
  2. Tap Get to download and install the app. When installation is complete, tap Open.
  3. Tap Start Using Avast One.
  4. Select Smart Scan, then wait while Avast One scans your device for vulnerabilities.
  5. Tap each issue to resolve it and begin protecting your device. Alternatively, tap the X icon to continue to the main Avast One screen.

Avast One is now installed on your iOS device. Continue to the Upgrade Avast One section of this article to upgrade to the paid version of Avast One.

Upgrade Avast One

You can purchase an Avast One subscription by tapping Upgrade in the top-left corner of the main app screen. Follow the on-screen instructions to complete the purchase.

Your paid subscription activates automatically. If you already purchased Avast One for iOS via another sales channel, you need to manually activate your subscription. For detailed activation instructions, refer to the following article:

Troubleshooting

If you experience any installation issues, ensure your iOS device meets the minimum system requirements.

  • Apple iOS 13.0 or later
  • Internet connection to download, activate, and maintain app updates

If the issue persists, contact Avast Support.

Further recommendations

To learn more about the features available in Avast One, refer to the following article:

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

  • Avast One 21.x for Windows
  • Avast One 1.x for Android
  • Avast One 1.x for iOS
  • Microsoft Windows 10 Home / Pro / Enterprise / Education - 32 / 64-bit
  • Microsoft Windows 8.1 / Pro / Enterprise - 32 / 64-bit
  • Microsoft Windows 8 / Pro / Enterprise - 32 / 64-bit
  • Microsoft Windows 7 Home Basic / Home Premium / Professional / Enterprise / Ultimate - Service Pack 1 with Convenient Rollup Update, 32 / 64-bit
     
  • Google Android 5.0 (Lollipop, API 21) or later
     
  • Apple iOS 13.0 or later

Was this article helpful?

Need additional help?

Contact us