Whenever I try to load my map from radiant, when I get into the game, this error message pops up: https://imgur.com/gallery/lFtCIP1 if you know how to fix this, that would be awesome

Go on the linkermod discord.
https://discord.gg/5Tjn5Gqyjc

Yes, the "Could not find script 'character/clientscripts/c_zom_quad'" error is extremely annoying because sometimes you never get it on some Windows installations, while on other Windows installations, you will always get it no matter what until you manually fix it. And I have no idea why the solution for this is no where to be seen on the public internet, even after doing multiple deep Google searches. I am hoping to break the ball by making this reply. But the solution that works for me at least is to go to your map's zone source file (Black Ops 1 directory --> zone_source --> zombie_yourmapname.csv), then adding the following line at the end of the file, "rawfile,character/clientscripts/c_zom_quad.csc". I hope this fixes the problem once and for all for whoever comes across this message.