Installation instructions
Download and unpack the RAR archive. You will get a setup.exe with some subfolders. Do not unpack the archive in the subfolder. Just run setup.exe and follow the onscreen-instructions.
The mod has to be installed into the "common" folder inside the Steam directory structure. The installer will try to direct you to the right point. During installation the setup will migrate some VPK files from your half-life 2 installation into the mod directory.
Please assure the complete download of Half-Life 2 and its episodes, before trying to install the mod. Start HL2, EP1 and EP2 at least one time.
The installation will take a while.