This version from GOG.com does not require an internet connection or 2K account to play.
Here are a few tips and tricks to help you get the most out of Mafia II: Definitive Edition: Mafia II- Definitive Edition -v1.0.1 GOG- MULTi...
The Definitive Edition serves as the second chapter of the Mafia trilogy, following war hero Vito Scaletta as he climbs the ranks of organized crime in post-WWII Empire Bay. Key Features of v1.0.1 GOG Edition This version from GOG