Hi ! I'm wondering if it is possible to play the old 1.5 version of cs while having steam ? My friends were able to play the 1.5 and 1.6. Can someone show me the settings ? TIA

It's easy. This is what I did: install Steam, delete the old CS1.5. Then reinstall CS1.5, it worked for me.

or just get game spy, and load up game spy, and connect to a game with 1.5 .... it works!