I'm running Windows 7 via bootcamp on my early 2015 Macbook Pro (via a separate guide: https://forums.macrumors.com/threads/guide-install-windows-7-in-macbook-pro-early-2015-with-almost-fully-support-include-track-pad.1992139/) and had to jump through many hurdles to get this working.
Everything works well for the most part other than the wifi.
My card is a Broadcom BCM94360CS; I've tried numerous drivers but almost ALL of them don't work whatsoever. The only one that worked for me was the Chinese driver listed in the guide above (direct link to driver: https://drive.google.com/file/d/0Bxq--onVE9j5T1dNY3BlRWxEZms/view?usp=sharing).
Whilst the driver works, it's connection speed and overall stability is quite terrible and it does not seem to support 5GHz networks (there is not even an option in the settings; other devices on the same networks have also had much faster speeds by comparison).
Since this is a Wifi driver issue, I was hoping somebody could kindly provide a stable driver capable of faster speeds and / or assist me in editing the INF file to enable such functionality.
I don't have any experience editing INFs or anything like that but I managed to get my unsupported 2015 Mac stable on Windows 7 so I feel I'm somewhat tech savvy if anyone has any advice.
Admittedly, I'm not even sure if I installed the drivers correctly the first time but nonetheless, spamming F8 to disable driver signature reinforcement when I boot up isn't such a big deal.
As for why I have to stick to Windows 7, it's related to compatibility with a programme needed for school. Windows 10 is simply not an option at the moment so don't waste your breath telling me to upgrade lol.