MA 2.6 should run on first generation Intel Macs on Snow Leopard, those which don't use the 64 bit OS.
Right now we're concentrating on Marine Aquarium 3.0 and making it as good as we can for Tiger, Leopard and Snow Leopard. The artwork Jim Sachs made for Marine Aquarium 3 is very, very good. Please take a look at the demo of Marine Aquarium 3 when it is available and see if it isn't worth the upgrade fee (no idea what that will be).
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