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Q; "The File could not be located in the installer's folder. Please make sure that the file is in the correct folder, or specify its current location" what do i need to do to fix it?
Check your anti virus to see if the Mafia "game.exe" file has been quarantined.
Depending on your anti virus program, you might be able to restore it.
The gog version of the game.exe film has known issues with several anit vrus programs doing a "False positive" on it.