Installing Datazen Enterprise server on Win 2012 R2 shows error message from IIS as "Error 4020. There was an error during the IIS configuration process."

Trying to install Datazen.Enterprise.Server.3.0.2908 , error msg popup "There was an error during the IIS configuration process.
Your original IIS configuration will be restored." during IIS configuration and installation setup files rollback .

Extract from Datazen Error log file

AI_IIsConfig: Installing "Datazen.Server.WebApi"
AI_IIsConfig: Installing "Datazen.Server.ControlPanel"
AI_IIsConfig: Installing "Datazen.Server.Renderer"
AI_IIsConfig: Installing "Datazen.Server.WebViewer"
AI_IIsConfig: Installing "Datazen.Server.Web"
Error 4020. There was an error during the IIS configuration process.
Your original IIS configuration will be restored.