[Ancient]

You can use cs 1.5 in steam rename

Install cstrike 1.5, rename the cstrike folder to csv15 and then put the csv15 folder in the /steamapps/username/half-life folder as a third party game etc... and then start playing cstrike 1.5, but first install the bot I used allinone 2.5 and then added clanmod etc... works great try it out. I perfer 1.5 over 1.6 anyday.