1.8.0 was an update for Team Fortress 2 Classic. It was released on February 8, 2015. It featured multiple additions and many more bug fixes. The patch notes are on the archived TF2C Wiki.
Fixed team collisions
Fixed the weapon menu bind
Fixed the ammo hud being incorrectly positioned
Added Colteh's fixed Tranquilizer model
Fixed cap icons for GRN and YLW
Fixed headshots and broken eyes. We're now using player models compiled by Dr.PySpy.
Added chowder908's GRN and YLW stickies
The game description in the server browser is now set depending on the gamemode
Killer and assister in the killfeed are now properly colored
Certain weapons now have proper muzzle flash model scales (Thanks to Onefourth for messing with the values and finding the ones that look best)
Fixed the Civilian crash
Ported the Scoreboard from live TF2
Added a 4 team scoreboard (currently broken on 4:3 resolutions) (Bassed off of onefourth's concept image)
Added a 4 team selection menu (models by sedimentarysocks, textures by onefourth)
HUD Death Notice text is now no longer white.
Fixed random team selection not choosing GRN or YLW
Changed the YLW Death Notice color to be more visible
Added dynamic lights for the muzzleflashes and the Flamethrower
Added the Fishwhacker
Modified the FGD
Additional model and texture fixes/improvements by Game Zombie
Model fixes by kida