Update v3.x (and specifically builds around this version) introduced the Freelancer mode, which is widely considered the best addition to the modern trilogy.
If you get a "Checksum error" or "Unexpected end of archive," ensure you have downloaded all related parts and that they are named identically (except for the part number). Installation Hangs: Hitman-WoA-Update-to-v3.180-by-ElAmigos.part1.rar
: Official Hitman WoA features, such as Elusive Targets and leaderboards, require a connection to the official servers , which unofficial patches generally cannot access. Safer Alternatives Update v3
The file refers to a community-repackaged update for Hitman: World of Assassination such as Elusive Targets and leaderboards