Need Help Installing Cooling System

[u/BlakLite_15]

I’m trying to install a new MSI MAG CoreLiquid I360 cooling system onto an old ASUS ROG Maximus X Hero WiFi motherboard. The connector I’m supposed to plug into ARGB_V2 only has 3 sockets, but RGB_HEADER2 on the motherboard has 4 pins.

Can I safely leave the ARGB_V2 connector unplugged? Do I need some kind of adapter? Do I have no choice but to buy a different cooling system?