There are few important steps to run CS 1.6 on MAC OS. There is no official version of Counter-Strike 1.6 based on this operating system, so to play this game you need to install Windows emulator.
STEP 1: Download Windows emulator and install in on your MAC device. We recommend you to use "Wineskin", because it is free and works pretty well. If download link doesn't work, download it from the official webpage - Wineskin.
STEP 2: Download Counter Strike 1.6 install file for windows (.exe) - links are below this post.
STEP 3: Now launch "Wineskin" or other Windows emulator that you have downloaded & installed. In the emulator go to the game folder, where you have downloaded CS 1.6 install and run install (.exe) file. Install the game like you do this in Windows. Done!
Now you can run and play Counter Strike 1.6 from installation directory on your MAC OS device!