Which Defender? It may help to clarify. I am also not clear on the "E5 policy" comment.
Is a New Version of Defender Installed With E5 Policies?

Maranya, Damon
251
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When a device first has one or more E5 security policies applied. Does a new version of Windows Defender get pushed down to the device at the same time, or is it just the policies that were applied?