1. Download Counter-Strike Beta 5.2 Bots.7z[www.google.com] (you will need 7-Zip[www.7-zip.org] or WinRAR to extract it).

2. Extract the contents to ..\SIERRA\Half-Life\cstrike replacing the old liblist.gam file when asked (or rename the old file if you want to keep a backup before extracting the files into the folder). Short video showing how to do this: http://i.imgur.com/3CrPlwK.gif

3. Done! You can configure the bots by modifying the ..\SIERRA\Half-Life\cstrike\PODBot\PODBot.cfg file, just open it in notepad for example. To open the bot menu ingame run the command: podbotmenu (this only works for non-dedicated servers, for dedicated servers you have to manually execute commands through the server console or rcon. You can find most commands in PODBot.cfg).

Note: Bots might be a little buggy or not work at all on some maps because no bots existed for CS Beta 5.2 originally and these bots are actually made for a newer CS version. They should work fine most of the time though.