The software automatically finds the other parts if they are in the same folder.

If you'd like to troubleshoot a specific error or find the right software for your device: Your (Windows, Mac, Android, etc.) Any error messages you're seeing

Ensure every numbered file is in one location. Use the right software: Use 7-Zip (Windows) or Keka (Mac). Open the first file: Right-click only the .001 file.

The file names must be identical except for the numbers.