Problem Solved for Broadcom 802.11ac WDi SDIO Adapter & bcmfn2.
I have struggled over 2 weeks to find a solution to the drivers for Broadcom 802.11ac WDi SDIO Adapter not installing. I tried Microsoft catalog and many other but the only way is to download the driver package from http://theminixforum.com:9009/drivers/Z83-4_CherryTrail-T3-64bit_drivers.zip. Follow the instructions under \installer\platforminstaller\drivers\Z83-4 WiFi driver
It works like a dream