Downloaded the game.. How do i actually launch it?

Black Mesa Archive Help!
#1

So i just downloaded it. and headed towards “C:\Program Files (x86)\Steam\steamapps\sourcemods\BMS”. But there is not an icon which allows me to start the game up.

Im a total source noob, so could someone explain to me how to start the game?

EDIT: Game doesnt show up in the steam library also

#2

restart steam

Founded in 2004, Leakfree.org became one of the first online communities dedicated to Valve’s Source engine development. It is more famously known for the formation of Black Mesa: Source under the 'Leakfree Modification Team' handle in September 2004.