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


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


  1. Download the installer from the Kaspersky website:
  2. Remove the application. In the Saving objects window, select the License information checkbox. See this article for instructions.
  3. Restart your PC.
  4. Run the installation file and follow the instructions in these articles:
  5. Activate the application. For activation guides, see Online Help:

What to do if the issue persists

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

Source : Official Kaspersky Brand
Editor by : BEST Antivirus KBS Team

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