The new version of Avast One provides access to multiple Avast apps through a single, unified interface. Since the apps available through Avast One are also offered as standalone applications, they cannot be installed at the same time due to compatibility restrictions. This article explains how to resolve common installation conflicts.

Conflicts while installing standalone Avast apps

If you attempt to install a standalone Avast app, such as Avast Free Antivirus, Avast Premium Security, Avast SecureLine VPN, Avast Cleanup, or Avast BreachGuard, while Avast One is installed, the installation will be blocked.

To resolve this, refer to the following options:

• Recommended: Cancel the installation of the standalone app and activate the desired app directly through Avast One. For instructions, refer to the following article: Installing and Activating Avast One apps ▸ Activate Avast One apps.
• Alternative: Uninstall Avast One and install the standalone app.

Conflicts while installing Avast One

If you attempt to install Avast One while having a standalone version of Avast Free Antivirus, Avast Premium Security, Avast SecureLine VPN, Avast Cleanup, or Avast BreachGuard, the installation will be blocked.

To resolve this, you must uninstall the standalone version of your app, then install Avast One. For detailed instructions, refer to the Uninstalling standalone apps section below.

Uninstalling standalone apps

The following applications should be uninstalled before installing the new Avast One:

• Avast Avast Free Antivirus ▸ Uninstalling Avast Free Antivirus
• Avast Premium Security ▸ Uninstalling Avast Premium Security
• Avast SecureLine VPN ▸ Uninstalling Avast SecureLine VPN
• Avast Cleanup Premium ▸ Uninstalling Avast Cleanup Premium
• Avast BreachGuard ▸ Uninstalling Avast BreachGuard

After uninstalling these apps, you can install the new Avast One and activate your apps through it. For instructions, refer to the following article: Installing and Activating Avast One apps.

Conflicts with the old Avast One

The new version of Avast One is not compatible with the previous version of the application. If you wish to use the new version of Avast One, you must first uninstall the old version and vice-versa. For detailed instructions, refer to the following articles:

• Uninstalling Avast One
• Installing Avast One

Conflicts with third-party apps

Avast One is not compatible with other antivirus apps. Before you uninstall Avast One, you must uninstall any other antivirus apps from your Windows device. For instructions on how to uninstall other Antivirus apps, refer to the following article: Uninstalling other antivirus software.

Updated on: 10/14/25