Here
https://steamcommunity.com/sharedfil.../?id=340974032 This steamcommunity Guide Works
Create one Folder Half Life only and other folder Just for Condition ZERO Etc. i think it will just cause problems if you try install multiple game servers into one same folder. make seperate folder for each HLDS Game
SteamCMD BUG: if you try to make THREE!! Folders of Servers... it will only give 37 something megabytes of HLDS Base files
so copy your server folders you made previously to another drive and then use C:/valveservers/GoldSrc etc.
Happy Gaming