To make a standard security update like KB915597 (Definition 1.155.1119.0) more engaging, it is best to move away from technical jargon and focus on the "heroic" aspect of keeping a system safe. The "Digital Bodyguard" Brief
To download the latest security intelligence updates for Microsoft Defender, you should use the official Microsoft Security Intelligence portal To make a standard security update like KB915597
If the file is a .cab (common for offline installs): To make a standard security update like KB915597
Using PowerShell (Run as Administrator): To make a standard security update like KB915597