Ensure you have every numbered part from the set in one folder.
Downloading files from unofficial sources carries significant risks:
Right-click part01.rar and select "Extract Here" using a tool like WinRAR or 7-Zip . It will automatically pull data from part02 and the rest.
After installation, there is often a folder named "CPY" inside the ISO. You must copy the files from that folder and paste them into the game's installation directory, overwriting the originals. A Note on Safety
Pirated files are a common delivery method for trojans, miners, and ransomware.