I think they install automatically, just not often enough when left alone. There are multiple ways to make it update more often..
See this:
https://docs.microsoft.com/en-us/win...nder-antivirus
You can also set a new Task in Task Scheduler, if you prefer:
The program/script to start should be: "C:\Program Files\Windows Defender\MpCmdRun.exe"
The "Add arguments" field should have this in it: -SignatureUpdate
Then set your interval... I haven't tested it, but that should do it.
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