To elaborate on Mavericks compatibility;
Some of you may recall the headaches we encountered when Mavericks was release a few years ago. For whatever reason, Apple decided to make a lot of undocumented low-level changes to OSX that caused major issues for a lot of different developers. We struggled for months to get DPS 1.x to work properly in Mavericks and still glitches occurred. Then, with the release of Yosemite, all of the problems were magically resolved! We did not have to change anything.
Thus, with the development of 2.0, we decided to look 10.10 and beyond as that seems to be the path Apple is taking. DPS 2.0 is working well in the pre-release versions of OSX 10.12 (Sierra).