There are a few threads on this.
Merxlin's is out of stock, so unless he has another source, it's all about luck, or dropping the coin on the Uwatec adapter.
The Mac software they wrote really only works with a particular chipset. Problem is there are a bunch of chipsets out there, and on little cheap things like this, very few manufacturers bother providing such arcane information about their gear. And the problem is the adapters will work fine as adapters, but unless they're the right chipset, they won't work with the Uwatec computers and software. (on a mac... the PC software is better supported, and less finicky)
Lots of adapters will work just fine with the Macs. And a lot more won't. It's all trial and luck, unfortunately, unless you buy the Uwatec one.
I got lucky. You might too. Try a few local shops, perhaps, that have return policies?