Windows Store Module Link Broken - OSX Unity 5.4.2f2

I do all my development work on OS X in Unity. I’m now trying to export a build for the Windows Store, but despite selecting “Windows Build Support” from the Unity Download Assistant, when I select Windows Store as a Build Setting target I get the following error message in the Build Settings window.

No Windows Store Module Loaded

There is a button below that which says “Open Download Page”, which opens my web browser to a broken link.

The link it’s trying to open is:
http://download.unity3d.com/download_unity/b7e030c65c9b/MacEditorTargetInstaller/UnitySetup-Metro-Support-for-Editor-5.4.2f2.pkg

Where can I get the Windows Store module for an OSX based Unity installation?

My understanding is that this build setting will generate a Visual Studio project, than I can then copy over to a Windows VM and create the UWP using Visual Studio.

You need to do it on a windows machine with a Windows SDK. Similar to having to have osx and xcode to compile for osx/ios which you can’t do directly from windows 7/8/8.1/10 etc.

From the Windows Platform/Windows Store manual page:

Currently if you want to build a Windows Store Apps player:

you have to do it on Windows 8.1 or higher when targeting SDK 8.1

you have to do it on Windows 10 or higher when targeting Universal Windows 10 Apps SDK.