"License problem detected" or "Invalid key file" error

You can encounter the "License problem detected" or "Invalid key file" error in a Kaspersky application even though the application was successfully activated earlier.

Cause

The issue occurs because of an error during the installation of antivirus databases.

Solution

1. Download the installer:
   • Kaspersky Basic, Standard, Plus, Premium
   • Kaspersky Internet Security
   • Kaspersky Anti-Virus
   • Kaspersky Total Security
2. Remove the application. In the Saving objects window, select the License information or Subscription information checkbox. See this article for instructions.
3. Restart your PC.
4. Run the installation file and follow the instructions in these articles:
   • Kaspersky Basic, Standard, Plus, Premium
   • Kaspersky Internet Security
   • Kaspersky Anti-Virus 
   • Kaspersky Total Security
5. Activate the application. For activation guides, see Online Help:
   • Kaspersky Basic, Standard, Plus, Premium
   • Kaspersky Internet Security
   • Kaspersky Anti-Virus 
   • Kaspersky Total Security 

What to do if the issue persists

If the issue persists, submit a request to Kaspersky Customer Service by choosing the topic and filling out the form.

Useful references

How to restore a Kaspersky application after reinstalling the operating system