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Had to spend some time searching for these drivers (these are tested to work fine on Windows Server 2012 R2):

 

For the Intel AC-3160 WiFi chipset download and install Intel® PROSet/Wireless Software, version 17.0.6.0.

 

For the Realtek RTL8187 chipset based USB adapters use Windows 7 (yes - 7!) 64-bit driver, version 62.1182.0331.2010 (03/31/2010) - look for net8187b.inf to install.

 

By the way, make sure that you have enabled the WLAN feature!