These are the instructions to install the HTC Desire 816 Dual Sim USB Driver on Windows Computer (this method can be used on Windows XP, Vista, Windows 7, Windows 8, 8.1 and Windows 10).
Requirements: You need to have a Windows Computer (x32bit or x64bit) to install the HTC Driver.
Readme Once:
[*] Download HTC Driver: You can download the latest HTC Driver from our Download Section.
[*] HTC Stock Firmware: If you are looking for the HTC Stock Firmware, then head over to the HTC Stock ROM page.
[*] Credits: HTC USB Driver is Officially Created by HTC Mobile Inc. So, Full credit goes to them for sharing the drivers for free.