Once you have all parts, simply right-click Part 1 and select "Extract Here." The program will automatically pull data from the subsequent parts (including your Part 4).

If you are seeing an error message while trying to open the file,

Multi-part RAR archives (like .part1.rar , .part2.rar , etc.) require to be in the same folder for the extraction to work. If any part is missing, the software (like WinRAR or 7-Zip ) will report a "missing volume" error and fail to extract the game files. Important Notes on this Version