MSI Cubi Cubi-018BUS and El Capitan, all working except Wi-Fi

This is a barebone mini PC kit with a Intel Core i5-5200U (Broadwell) / HD5500. Specs can be found here http://us.msi.com/product/barebone/Cubi-Mini-PC-Kit.html#hero-specification&sku_no=434

I added 16GB (2x8GB) of DDR3L RAM, and 2 SSDs (1 mSATA, 1 2.5" SSD). The kit is hooked to my Dell U2415 via DisplayPort. Dualbooting Windows 10 and MAC OS X (each on its own separate harddrive).

Everything is working nicely, except Wi-FI.

Basically, I followed this installation guide...

MSI Cubi Cubi-018BUS and El Capitan, all working except Wi-Fi