An air-gapped machine cannot update its definitions. Kaspersky provides a utility called the (often found in the corporate Endpoint Security toolkit). This tool allows you to download updates to a connected "management" machine, package them, and transfer them to the air-gapped network via USB or secure transfer protocol.
Ensure every machine in your organization runs the exact same version and configuration. Types of Kaspersky Standalone Installers kaspersky standalone installer
You're looking for a Kaspersky standalone installer. Here are some key points and a direct download link: An air-gapped machine cannot update its definitions