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 product (Avast One Essential) and paid product (Avast One). This article explains how to install the free version of Avast One, then optionally upgrade to the paid version.
Install Avast One
- 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 for Windows - 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 the installation of Avast One, refer to the following article for advice: Managing administrative accounts on your Windows PC. - If prompted for permission by the User Account Control dialog, click Yes.
- To change the default setup language, click the current language in the top-right corner of the screen and select your preferred language. Then click Install Avast One.
- Wait while setup installs Avast One on your PC.
- Click Let's get started to begin a free trial of Avast One Premium.
Avast One is now installed on your PC and the application Home screen opens automatically.
Upgrade to Avast One Premium
When your free trial ends, you can purchase an Avast One Premium subscription by clicking Go Premium in the top-right corner of the application screen. Follow the on-screen instructions to complete the purchase.

Your subscription activates automatically.
Still need help?
If you experience any installation issues:
- Ensure your PC meets the minimum system requirements:
- Windows 11 except Mixed Reality and IoT Edition; 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 SSE3 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 application updates and antivirus database
- Optimally standard screen resolution no less than 1024 x 768 pixels
- Uninstall any applications from your PC that are incompatible with Avast One. For more information, refer to the following article:
- Restart your PC, 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:
For instructions on how to use Avast One, refer to the following article:
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 product (Avast One Essential) and paid product (Avast One). This article explains how to install the free version of Avast One, then optionally upgrade to the paid version.
Install Avast One
- 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 - Double-click the downloaded setup file
avast_one_online.dmg
. - Double-click the Avast One icon.
- In the new window, click Allow/Continue.
- Click Continue to confirm that you accept Avast's Privacy Policy.
- Click Continue to confirm that you have read the End User License Agreement, then click Agree to confirm that you accept the terms.
- Click Install to proceed with default installation. Alternatively, click Change Install Location... if you want to make changes to the default setup.
- 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.
- When the System Extension Blocked notification appears, click OK.
- Click Close ▸ Move to Trash.
- If prompted, click OK to allow the Avast One installer to access your downloads folder.
- Click Continue.
- 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.
If you already purchased an Avast One subscription, ensure you sign in using the same email address that you provided during purchase. - Click Open, then follow the on-screen instructions to allow permissions for Avast One. For detailed instructions, refer to the following article:
- Click Got it to confirm that Avast One is installed and protecting your Mac.
Avast One Essential is now installed on your Mac and the application Home screen opens automatically.
Upgrade to Avast One Premium
You can purchase an Avast One subscription by clicking Go premium in the top-right corner of the application screen. Follow the on-screen instructions to complete the purchase.

Your subscription activates automatically. If you already purchased an Avast One subscription before installation, you need to manually activate it. For instructions, refer to the following article:
Still need help?
If you experience any installation issues:
- Ensure your Mac meets the minimum system requirements:
- 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 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
- Uninstall any applications from your Mac that are incompatible with Avast One. For more information, refer to the following article:
- 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:
For instructions on how to use Avast One, refer to the following article:
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 device.
Install Avast One
Avast One is available as both a free product (Avast One Essential) and paid product (Avast One). To install Avast One, choose your version:
- On your Android device, tap the button below to open the Avast One product page in Google Play Store.
Go to Google Play Store - Tap Install to download and install the app. When installation is complete, tap Open.
- Tap Get started.
- Tap Skip. Alternatively, tap Continue to move through the welcome screens.
- Tap Continue and select Allow to give Avast One permission to send you notifications. Alternatively, select Don't Allow.
- Tap Continue with free version.
Avast One Essential is now installed on your Android device.
Upgrade to Avast One Premium
You can purchase an Avast One subscription by clicking Go Premium in the top-right corner of the app screen. Follow the on-screen instructions to complete the purchase via Google Play Store.

Your subscription activates automatically. If you already purchased an Avast One subscription before installation, you need to manually activate it. For instructions, refer to the following article:
- On your Android device, tap the button below to open the Avast One product page in Google Play Store.
Go to Google Play Store - Tap Install to download and install the app. When installation is complete, tap Open.
- Tap Get started.
- Tap Already purchased?.
- Choose the relevant option to activate your paid subscription.
- Sign in to your Avast account: Connect your Avast account using your Avast Account credentials.
- Restore subscription from Google Play: If you purchased Avast One through Google Play, you can follow the on screen instructions to restore your subscription. Ensure you are signed in to the Google Play Store with the same Google Account that you used to purchase Avast One.
For detailed activation instructions, refer to the following article: Activating an Avast One subscription
Avast One is now installed on your Android device.
Still need help?
If you experience any installation issues, ensure your Android device meets the minimum system requirements.
- Google Android 8.0 (Oreo, API 26) or later
- Internet connection to download, activate, and maintain app updates
If the issue persists, contact Avast Support.
Further recommendations
To learn more about 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, spyware, and other malicious threats. Additionally, it protects you and your data from hackers while you are online.
Install Avast One
Avast One is available as both a free product (Avast One Essential) and paid product (Avast One). To install Avast One, choose your version:
- On your iOS device, tap the button below to open the Avast One product page in the App Store.
Go to the App Store - Tap the Download button to download and install the app. When installation is complete, tap Open.
- Tap Get started.
- Tap Skip. Alternatively, tap Continue to move through the welcome screens.
- Tap Continue and select Allow to give Avast One permission to send you notifications. Alternatively, select Don't Allow.
- Tap Continue and select Allow in the data-usage dialog to give Avast One permission to track your activity across other apps and websites. Alternatively, select Ask App Not to Track to deny tracking permission.
- Tap Continue with free version.
Avast One Essential is now installed on your iOS device.
Upgrade to Avast One Premium
You can purchase an Avast One subscription by clicking Go premium in the top-right corner of the app screen. Follow the on-screen instructions to complete the purchase via the App Store.

Your subscription activates automatically. If you already purchased an Avast One subscription before installation, you need to manually activate it. For instructions, refer to the following article:
- On your iOS device, tap the button below to open the Avast One product page in the App Store.
Go to the App Store - Tap the Download button to download and install the app. When installation is complete, tap Open.
- Tap Get started.
- Tap Skip. Alternatively, tap Continue to move through the welcome screens.
- Tap Continue and select Allow to give Avast One permission to send you notifications. Alternatively, select Don't Allow.
- Tap Continue and select Allow in the data-usage dialog to give Avast One permission to track your activity across other apps and websites. Alternatively, select Ask App Not to Track to deny tracking permission.
- Tap Already purchased?.
- Choose the relevant option to activate your paid subscription.
- Sign in to your Avast account: Connect your Avast account using your Avast Account credentials.
- Restore subscription from Google Play: If you purchased Avast One through Google Play, you can follow the on screen instructions to restore your subscription. Ensure you are signed in to the Google Play Store with the same Google Account that you used to purchase Avast One.
For detailed activation instructions, refer to the following article: Activating an Avast One subscription
Avast One is now installed on your iOS device.
Still need help?
If you experience any installation issues, ensure your iOS device meets the minimum system requirements.
- Apple iOS 14.0 or later
- Internet connection to download, activate, and maintain app updates
If the issue persists, contact Avast Support.
Further recommendations
To learn more about Avast One, refer to the following article:
For instructions on how to use Avast One, refer to the following article:
- Avast One 23.x for Windows
- Avast One 23.x for Mac
- Avast One 23.x for Android
- Avast One 23.x for iOS
- Microsoft Windows 11 Home / Pro / Enterprise / Education
- 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
- 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 10.13.x (High Sierra)
- Google Android 8.0 (Oreo, API 26) or later
- Apple iOS 14.0 or later
Updated on: June-02-2022