WX 8.1 and 16.3 Could not load file or assembly System.Web.MVC

Problem - Could not load file or assemble System.Web.Mvc when launching AX Admin

Please note to make a backup of the web.config before any modification. 
Open the web.config for WebXtender or Admin,
Find the section system.web.mvc
Change the version to

Reset IIS and launch the site again

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