Archaic59 :
You'll find the download link under 'utilities'-
https://www.asus.com/us/Motherboards/B85MG/HelpDesk_Download/
As far as overclock, you may be able to change multiplier (not positive) but I would not mess with voltage.
I didnt find the link there, it only said 4 things. It only installed usb 3.0 setup instead.
Intel(R) Management Engine Interface V11.0.0.1146 for Windows 10 32bit & 64bit.
ASUS Ai Charger V1.05.00 for Windows Win10 32bit & 64bit.
AI_Suite_III_USB3_Boost_V1_10_00 for Win10 32bit & 64bit
ASUS Probe II Sense Driver 1.0.1.0 for Windows Win7 32bit & Win7 64bit & Win8 32bit & Win8 64bit & Win8.1 32bit & Win8.1 64bit & Win10 32bit & Win10 64bit---(WHQL).