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Hammer Setup (for GMod 9/SDK 2006)

Files you need

Extract zip archive (use 7zip or WinRAR , both free)
Download Source SDK
Go to "sourcemods" folder ("[path_to_steam]\steamapps\sourcemods") steam path usually is C:\Program Files (x86)\Steam
Create a folder titled "gmod9_dummy"
Copy gameinfo.txt from zip archive to gmod9_dummy folder
Go to "[path_to_steam]\steamapps\common\SourceSDK\bin\ep1\bin"
Replace steam.dll with one provided in the zip archive
Copy GameConfig.txt from the zip archive to bin folder
Open GameConfig.txt in notepad or any other text editor
Replace every [path to steam] with your steam path, you can also change default map directory C:\gmod9_maps (line 24) and save the file
Create config folder inside bin folder
Copy SteamAppData.vdf from the zip archive to config folder
Create resource folder inside bin folder
Copy SourceScheme.res from the zip archive to resource folder
Now you can launch hammer like this hammer.exe -allowdebug -game [path to steam]\steamapps\sourcemods\gmod9_dummy
or use provided batch file hammer.bat, open it in notepad and replace [path to steam] with your steam path