“Unknown error” during activation (Kaspersky)

Issue

When activating a Kaspersky application, you may encounter the “Unknown error” message.

Solution

Install the latest version of the application.

1. Download the installer from the Kaspersky website:
   • Kaspersky Security Cloud
   • Kaspersky Internet Security
   • Kaspersky Anti-Virus
   • Kaspersky Total Security
   • Kaspersky Small Office Security
2. Uninstall the current version of the application. For instructions, see this article.
3. Reboot the your computer.
4. Run the installation file and follow the instructions in these articles:
   • Kaspersky Security Cloud
   • Kaspersky Internet Security
   • Kaspersky Anti-Virus
   • Kaspersky Total Security
   • Kaspersky Small Office Security
5. Try to activate the application once again.

What to do if the issue persists