A huge amount of work has gone into it, but the Mac version now works fine with Mac OS X 10.9 (Mavericks), 10.10 (Yosemite), and 10.9 (El Capitan). The minimum version of Mac OS X required is now 10.4 (Tiger) instead of 10.3.9 (Panther).
Unfortunately the same can not be said of many of the Mac games themselves that no longer work on the newer versions of Mac OS X. That's outside of GameRanger's control.
Does this mean we can play borderlands again. <head asplode>
But with all the work that has gone into it, he could have spent a few minutes more to adapt it to Retina displays (or at least include a higher resolution icon).