The error "License problem detected. We cannot verify that the databases comply with the End User License Agreement" appears upon database update attempt.

License problem detected. Cannot verify correspondence of databases to the End User License Agreement

Solution

Check the system date and time. For the instructions, see this article.
If the system date and time are correct, but the issue persists, reactivate the application with a valid activation code. For the instructions, see this article.
If the instructions above did not help, reinstall the application. For instructions see below.

What to do if the issue persists

If the error persists, submit a request to Kaspersky technical support via My Kaspersky. Please include a detailed description of the issue.

Through My Kaspersky, if you are using Kaspersky Security Cloud, Kaspersky Internet Security, Kaspersky Anti-Virus or Kaspersky Total Security. See the Online Help page for instructions.
Through Kaspersky Small Office Security Management Console, if you are using Kaspersky Small Office Security. See the Online Help page for instructions.