The best way to play it today is through the version, which is DRM-free, patched for modern PCs, and includes the "The Stetchkov Syndicate" expansion. 🛑 Important Safety Warning
Many older torrents for SWAT 4 contain "cracks" that modern antivirus software will flag as Trojans.
Useful if you want to play a private "LAN" game with specific friends. If you'd like to get started, I can: