See: How do I install a map or mod?
I'm rounding this up from a 4.9 to a 5 because the only flaw I can see is that the Scavenger factory near base 0 doesn't produce any units. However, that Scavenger base is more than sufficient to prevent any rushes.
Especially the "blocked" oil derricks are a nice twist for the early game. One of the best (currently the best) symmetric 1v1 maps I have seen so far.