WORKAROUND
When installing the Defender Security Server, select the "Defender Administration Console". This will allow the installation to succeed and the Defender Security Service will started.
If upgrading from an earlier version of Defender, the option to select the "Defender Administration Console" will not be given. In this instance, prior to upgrading Defender, use Program and Features to Change the current install of Defender, and install the "Defender Administration Console". Then upgrade to 5.11.
STATUS
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