You only need to right-click and extract Part 1 ; your extraction tool (like WinRAR or 7-Zip) will automatically pull data from the subsequent parts, including part 16, to reconstruct the full game files.
When a game this large—roughly —is distributed outside of standard launchers like Steam or the Epic Games Store , it is often split into many small files (parts). UNCHARTEDLegacyThievesCollection.part16.rar
If you are preparing to install this collection, reviewers from PCMag and GameRevolution highlight several key points about the PC port: Go to product viewer dialog for this item. Uncharted: Legacy of Thieves Collection You only need to right-click and extract Part
To successfully install the game, you must have all parts (e.g., part01 through part16 and beyond) in the same folder. including part 16