Download Syncovery 6.49e for Mac
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This version works on all Intel Macs and it is compatible with Mac OS X 10.8 and 10.9. “Mountain Lion” and “Mavericks”. Versions before 6.03 were not compatible.
To install it, you may need to go to the Mac OS System Preferences, Security & Privacy, and specify that you want to allow apps downloaded from: Anywhere.
Please see also: Mountain Lion Compatibility