Try turning off some graphics settings in 64-bit, or just tick the 'Pixelate' box
you may be using a wrong version of the game, example: you have an 32-bit OS and downloaded the 64-bit version or the other way around
well you can download the 32-bit version if you didn´t already
do you by any chance have a 32-bit OS?
yes but if you´re not on the same network try using hamachi to create a virtual one so the game thinks you´re on the same network, or you can just buy the steam version for 5 dollars
you can use hamachi to create a virtual LAN network to play together