Move the extracted contents directly into your main GTA IV installation folder (where GTAIV.exe is located).
Follow any specific instructions provided in a readme.txt file (often involving running a specific patcher or setting dxvk configuration). Troubleshooting & Tips GTAIV4CE.1.1.3.0.part1.rar
The string naming convention provides explicit details about the contents of the payload: Move the extracted contents directly into your main