How do I get the Hard Rain environment effects into my own map?

I’m trying to create a map for L4D2 but I can’t get the Hard Rain environment stuff to work. Yes, I’ve googled it. I found many tutorials but the wording is shite.

I’ve added the three instances I was told to, but when I compile I get this error:
Could not open instance file instance/c4_storm_logic.vmf
There isn’t a c4_storm_logic, there is however a c4m4_storm_logic which I’ve already included as an instance. What am I doing wrong?

Don’t try to compile using the actual instance file in your map (stuff glows orange). You need to turn Ignore Groups on and select everything, then copy and paste it to your map.