Notice for those running into the same headache from the recent version of Viewer (7.62).
If you use the Settings Configuration of the MSI Configurator it makes a call to a RUTSERV.EXE file which I presume is what creates the configuration for the Host.
This EXE file is missing from the current install of 7.62 (even attempting a fresh install).
I still had a copy from the 7.61 portable version and it seems to work with the 7.62 and completed the task of creating the MSI.
It is missing from the ASSETS folder.