If you only have 2GB of RAM total on your computer, the 4GB patch won't help you. It's designed to allow the game to use more than 2GB of RAM if extra is available (up to a maximum of 4GB total). With only 2GB total for your whole system, there will never be in excess of 2GB available to the game so the patch will not do any good and it's unlikely that you will be able to run the MFM mod.
You can try the lite version, or just add selected ships one by one to see if that works, but the full mod just needs more juice than what your system can provide. Sorry.
