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any plans to make the software compatible with Mountain Lion 10.8+?
I've been using the arRsync on OS X 10.8 MountainLion without issue. If you right-click on the icon and choose open you can go ahead and launch it regardless of the lack of a digital signature. Once you do this once, you can open the app as normal.
It would of course be better if the app was signed, but being an open source project, the $99 a year for the needed Apple Developer Account could be a major obstacle.