You cannot open or extract Part 2 by itself. You must have all parts (Part 1, Part 2, etc.) downloaded and saved in the same folder.
The extraction software (like WinRAR or 7-Zip) uses Part 1 as the entry point and automatically pulls data from the subsequent parts to rebuild the full game installer. How to Install
Move every part (Part 1, Part 2, etc.) into the same directory on your PC.
Right-click Part 1 and select "Extract Here." WinRAR will automatically find "Part 2" and combine them into a single folder containing the game files or an ISO image.
Open the extracted folder and run setup.exe to begin the installation. Important Precautions