IIS 8.5 Installation Error

I get the following error when attempting to access the site when installing to Win2k12R2 IIS 8.5.

Module	       IIS Web Core
Notification   BeginRequest
Handler        Not yet determined
Error Code	   0x80070021
Config Error   This configuration section cannot be used at this path. This happens when the section is locked at a parent level. 
               Locking is either by default (overrideModeDefault="Deny"), or set explicitly by a location tag with
               overrideMode="Deny" or the legacy allowOverride="false".
Config File    \\?\C:\Program Files\ProGet\WebApp\web.config
Config Source:
  32:     </security>
  33:     <handlers>
  34:       <remove name="rules-ISAPI-4.0_64bit" />

Product: ProGet
Version: 3.6.1

If you're seeing this message, then you'll need to ensure ASP.NET4 is installed -- not just .NET4 and .NET4 Extensibility. It's a separate option (that's kinda hidden).