PartToosl not producing ksp file on Linux

[StarStryder]

So, I'm playing with creating a mod with a UI.  I'm following the tutorial here:

I've got the Exporting the Asset Bundle section.  In the AssetCompiler window, when I update, I get an error about WindowsStandalone support not being allowed because the required module is missing. Where can I find this module and how do I install it?

[StarStryder]

ok, so I found somewhere saying that you choose platform support at installation so I had a hunt through AUR (I'm running Manjaro) and found a unity-editor-windows package for the version of Unity I have installed.  I shutdown Unity, installed the Windows support package and started Unity up again.  Same error.  I also found an option in Build Settings to select the platform but only Linux was in the list.

Do I have to do anything particular to get it to pick up the Windows stuff?