You must have Part 1, Part 2, Part 3, etc., in the same folder.
Files labeled "Full Unlocked" from unofficial sources carry a high risk of containing malware or miners. It is highly recommended to scan the contents with updated antivirus software before and after extraction. The.Crew.2.Gold.Edition.FULL.UNLOCKED.part4.rar
You use a tool like WinRAR or 7-Zip to "Extract" Part 1; the software will automatically pull data from Part 4 and the others to recreate the full game folder. You must have Part 1, Part 2, Part 3, etc
These files are often distributed outside of official storefronts like Ubisoft Connect or Steam, which bypasses digital rights management (DRM). You must have Part 1