Xamarin 5.0 provided the impetus to finally put the shader coloring plugin into the live Xamarin Studio Addin Repository. This will host and build versions of the plugin for both Xamarin Studio 4.x and Xamarin Studio 5.x. An added benefit is you can search, download and install the plugins within the Add-in Manager in MonoDevelop. The steps to do this in Xamarin Studio are simple:

1. open the Add-in Manager from the menus
2. on the Add-in Manager Update tab hit ‘Refresh’
3. on the Add-in Manager Gallery tab search for ‘mime’
4. install “Unity Mimetypes”