Ya, exactly what he said, just remember if I am not mistaken CS 1.4 is pre steam counter strike so you are going to have to look for a download elsewhere to get the original 1.6 then its just a matter of installing. But ya if you want css you are going to have to purchase either HL2 of the css game itself.Counter-Strike and Counter-Strike: Source are completely different games that use two different game engines, so, no, you can't. As for updating the original CS, try looking at download.com, or go directly to Sierra's website, they might have it there as well.
Well since I did already mention that, you can buy CSS on its own which will save you some money if you don't want HL2, its cheapest to download CSS from steam and just pay online for it, I believe its like $20 in their online store.Now that others have pointed out how to get your update (for CS), I'll mention that you should get HL2 (which will also give you Counter Strike: Source). It is a great game and is the only way you'll get CSS.
Well since I did already mention that,
You betterOh I'm sorry, did I forget to give you credit? (JK)
You better
Advice that good is hard to come by lol