Missing textures on weapons

Black Mesa Archive In-game Issues
#1

I recently downloaded the new update to Black Mesa unfortunately the update broke my weapons such as the pistol,the Shotgun,Mp5,Crossbow,Rocket Launcher,Grenades,Tripmine,Snarks and the gluon gun. All those weapons have this disgusting purple and black texture. Is there any fix for this situation. Thanks

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.