Dynamic Clothing Support is now offered in DAZ Studio 4 on both platforms (Windows and Mac) and in both bit versions (32-bit and 64-bit). Make sure you update to the latest build of DAZ Studio 4. At the time of this article revision, the latest build of DAZ Studio 4 was 4.5.0.114.
DAZ Studio 3 only has dynamic clothing support in Windows in the 32-bit version.