“Unknown error” during activating a Kaspersky application

Issue

When activating a Kaspersky application you can encounter the "Unknown error” message.

Solution

Install the latest version of the application.

1. Download the installer from the Kaspersky website:
   • Kaspersky Standard
   • Kaspersky Plus
   • Kaspersky Premium
   • Kaspersky Internet Security
   • Kaspersky Anti-Virus
   • Kaspersky Total Security
   • Kaspersky Small Office Security
   • Kaspersky Free
   You can no longer download Kaspersky Security Cloud. Switch to our new Kaspersky Premium solution.
2. Uninstall the current version of the application. For instructions, see this article.
3. Restart your PC.
4. Run the installation file and follow the instructions from these articles:
   • Kaspersky Standard, Plus, Premium
   • Kaspersky Internet Security
   • Kaspersky Anti-Virus
   • Kaspersky Total Security
   • Kaspersky Small Office Security
   • Kaspersky Free
5. Try to activate the application once again.

What to do if the issue persists

If the issue persists, contact Kaspersky Customer Service.