1.] Mutli-protocol: 46 (WON) 47 (2005 & later) 48 (Steam)
2.] Game-dir selection, from which game starts ("valve", "ag", etc.)
3.] Change start parameters (-d3d -16bpp -w 800 -h 600 -full -console)
4.] Selection of texture type (user textures or gray)
Unpack all files from "valve" folder to your "valve" folder, ex.: C:\Program Files (x86)\Half-Life\valve
Unpack all files from archive to your main game directory, ex.: C:\Program Files (x86)\Half-Life