If you press 9 on that main error screen the game loads but there is a flashing error that wont go away. You can insert coins but the game start buttons don't respond.
I seem to remember 2 being impossible to complete (even with cheats). Number 1 was by far the best and as Basely says the music just fantastic. Psygnosis really knew how to get the best out of the Amiga.
The megatech version is actually identical to the genesis/megadrive version, only it's arcade based. Look for the zip James mentioned for the true arcade version.