Always scan portable executables with VirusTotal. Because these files modify .exe behavior to bypass Steam, antivirus software will flag them as "RiskTool" or "HackTool." This is usually a false positive due to the crack, but download only from trusted private trackers.
The risks (malware, legal issues) far outweigh any convenience. If you want CSCZ, buy the $5 legitimate version on Steam. It will work on almost any PC made in the last 15 years and is the safest, most complete way to experience the game. Counter Strike Condition Zero Portable
Let's address the elephant in the room. occupies a grey area. What is "Counter-Strike: Condition Zero Portable"