Here, I mashed it all together for you.
www.pastebin.com
Instructions: (AlterIWnet, I do not have experience with Steam, at all.)
1) Goto the PasteBin link, and click the: "Download" link, in the top of the document.
2) Open the downloaded text file.
3) Goto: File -> Save As.. And save it as _rank.gsc (IMPORTANT: Change the format to all formats, else it will save it as .txt.)
4) Open your Modern Warfare 2 folder.
5) If you don't already have it, make a folder in the MW2 directory, called: "mods" (Remember: Do NOT add the quotation marks (the "")
6) Make a new folder in the mods folder called: "anti-camp", or whatever you like.
7) Make a new folder called: "maps"
8) Make a new folder called: "mp"
10) Make a new folder called: "gametypes"
11) Paste the _rank.gsc file in the "gametypes" folder.
12) Go back, until you're in the "anti-camp" folder.
13) Right click the maps folder and click: "Add to archive..." (Requires WinRAR. Google it.)
14) Set it as a .zip file, and not .rar.
14) Change it from maps.zip to maps.iwd
15) Open Modern Warfare 2. (alterIWnet)
16) Type following in the console: "fs_game mods/anti-camp;vid_restart"
17) Host a Private Match, or become host in a Public Match. And voila, there's gonna be no campers!
If you don't understand some of the steps in this, please, feel free to ask.
