It is important to keep your antivirus updated and you it can be updated when you are connected to the internet. In case, you are not able to do so then definitely there is some issue in your antivirus application, you can use these given steps that will help you in fix this situation.
https://kasperskysupportireland.wordpress.com/2017/08/24/what-are-the-steps-to-fix-updates-issue-in-kaspersky-antivirus/
