You have to unpack zip archive to your Mafia 2 Definitive Edition directory. ZIP archive can be unpacked by using 7zip or Winrar. You can open your Mafia 2 Definitive Edition directory by right clicking on "Mafia 2 Definitive Edition" on the game list in Steam application, then select properties, go to local files tab and click "Browse...". This will open your Mafia 2 Definitive Edition directory in windows explorer. Now open zip archive with 7zip or winrar, select all files inside zip file, drag and drop into the Mafia 2 Definitive Edition directory and allow to replace the files. If you have done everything right like I said above, then it should work now.
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You can open your Mafia 2 Definitive Edition directory by right clicking on "Mafia 2 Definitive Edition" on the game list in Steam application, then select properties, go to local files tab and click "Browse...". This will open your Mafia 2 Definitive Edition directory in windows explorer.
Now open zip archive with 7zip or winrar, select all files inside zip file, drag and drop into the Mafia 2 Definitive Edition directory and allow to replace the files. If you have done everything right like I said above, then it should work now.