You only need to right-click Part 1 and select "Extract Here" using WinRAR or 7-Zip . The software will automatically pull data from Part 3 to complete the file.
If this is related to a research paper (such as the RAR: Reversing Visual Attention Re-Sinking paper), you may be looking for supplementary code or data patches. Download patch part3 rar
If you receive a "Checksum Error" or "Missing Volume" message, Part 3 may be corrupted or missing from the directory. Seeking a Specific "Proper Paper" or Patch? You only need to right-click Part 1 and