You need a utility like WinRAR or 7-Zip . Right-clicking on "Part 1" and selecting "Extract Here" will automatically pull data from Part 18 and all other segments to recreate the full game installer.
Downloading this file constitutes software piracy, which is illegal in many jurisdictions and violates Ubisoft’s Terms of Service. Recommended Action download-watch-dogs-legion-apun-kagames-part18-rar
This specific file, download-watch-dogs-legion-apun-kagames-part18-rar , is a single segment of a multi-part compressed archive for the game , typically hosted on third-party "repack" or "crack" websites like Apun Ka Games. You need a utility like WinRAR or 7-Zip