The main reason people resort to pirate ZIPs is to get pre-modded versions (e.g., with HD textures, cars, or the "Hot Coffee" restoration). Instead of risking malware, install mods manually:
All of these are free and legal.
Right-click the ZIP file > Properties > Advanced. If you see "Encrypt contents to secure data," you may need your Windows user account password, not a ZIP password.
If you are stuck at a password screen, do not waste time trying to guess it or completing surveys. Instead, follow these steps: