Once the Web PI window opens, you are greeted with a streamlined interface:
And there, in a neat, terrifyingly organized list, were all his missing pieces. URL Rewrite 2.0 (64-bit). .NET Framework 4.6 (Already present, but WPI verified it). PHP Manager 1.2. Even a sneaky little Windows Cache Extension 1.3 he didn't know he needed.
: The WebPI feed was removed from servers, and installers were pulled from official download sites. Direct Download Status
If you are setting up a new server or development environment today, you should not use Web Platform Installer 5.0. Instead, utilize these modern alternatives: