Download link.
Gameplay Video.
How To Install.
To play this mod you need to have been installed on your computer Steam program.
Then install Half-Life 2 with Source SDK Base 2006 in Steam.
When it have been installed, quit Steam.
Download "hl1_2004.rar" archive in provided above link.
Once it is finished downloading, open this "hl1_2004.rar" archive with WinRAR program.
You will see "hl1_2004" folder in this "hl1_2004.rar" archive.
Extract it to your "sourcemods" directory, usually -
"C:\Program Files (x86)\Steam\steamapps\sourcemods".
When it has been extracted, launch Steam.
In Steam Library you will see "Half-Life: Source 2004".
Left-click on "Play".
That's all.