Open the extracted folder and look for Setup.exe or a similar executable to begin the installation.
Before you can use part04.rar , you must download associated with the game (e.g., Part 01, Part 02, Part 03, etc.). Navigate to the ApunKaGames page for Need for Speed: Heat. download-need-for-speed-heat-apun-kagames-part04-rar
The software will automatically pull data from part04.rar and all other parts to recreate the original game folder. Open the extracted folder and look for Setup