When you connect the PowerA USB controller onto a Windows 7 system you will get an error that no driver was found for xbox one pro ex controller.
The driver can be downloaded at http://www.techspot.com/drivers/driver/file/information/17648/
(Blue Download Now icon on left side of screen)
The SHA256 checksum is 0e38d565eef8ac2cdd520ee246e643d9db6f7152f3ed0b938167c29f3e6a2a00
The file can be scanned at https://virustotal.com/ to confirm the checksum matches.