I had the error in Device Manager showing that H100i v2 driver wasn't installed. This is what I did was go into the where it showed the hardware ID USB\VID_1B1C&PID_0C09&REV_0100
Then copy and pasted it into the google search it showed the Drivers for manufacturers Corsair. Put in the H100i v2 it gave me the driver. Installed the driver and everything is fine.
https://www.driverscloud.com/en/services/GetInformationDriver/73897-106977/corsair-icuesetup-32875-releasemsi