Download _verified_ Definition Update: For Windows Defender Kb915597 Definition 155 11190 Better

If you prefer the command line to verify you are on 155.11190.0 :

The update is a critical "security intelligence" update for Microsoft Defender Antivirus . It contains the latest virus and spyware definitions that allow your operating system to identify and neutralize emerging threats like ransomware and malware. If you prefer the command line to verify you are on 155