To download Counter-Strike: Condition Zero for free on PC, you'll need to find a reliable source. However, be aware that downloading copyrighted content without permission is against the law. If you're interested in playing the game, consider purchasing it through a legitimate platform like Steam or GOG.
New players who get destroyed in CS2 multiplayer can use CZ's "Deleted Scenes" to learn map layouts, recoil patterns (for M4A1, AK-47, AWP), and economy management without toxic teammates yelling at you.