Sophos Central Endpoint and SEC: Computers fail/hang on boot after the Microsoft Windows April 9, 2019 update. Please follow knowledge base article 133945

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How to do a silent install of Sophos Clean

Tried running SophosClean_x64.exe with the /LIC= switch but this only opened the interface to the install dialogue box.  Does anyone have a command line or script that will fully and silently install Sophos Clean?