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#11
I downloaded and extracted. In the Drivers folder, there is a production folder, then Windows8.1-x64 and Windows8.1-x86 folders. Inside each one of those is a WLAN-Driver folder. Inside each WLAN-Driver folder is and atwhb.inf or atwhbx.inf file.
In File Explorer, under the View menu, make sure you have "File name extensions" checked - that might be what you were missing.
So, in Device Manager, right click on the network adapter that needs the driver, Update driver software..., Browse my computer, Let me pick from a list, Have Disk, Browse. Point it to the .inf under the correct folder for 64bit or 32bit corresponding to the same Windows bit level, Click OK, pick the right hardware from the list, click Next. Keep your fingers crossed and hope for the best!