Ok so... I downloaded the .zip file, it has launch1w5m.exe, and DBnetwork.indigo.dll I also am downloading the dedicated server.
I know this so far:
Navigate to the modern warfare 3 folder in the /steamapps/common folder and create a folder called dw- don't drag anything into it
Pull the DBNetwork, and LaunchIW5M.exe into the mw3 folder that was navigated to
Then, just open the LaunchIW5M, log into your FourDeltaOne account, and you're good to go.
Am I leaving anything out?