MasterJuggler 3 requires OS X 10.1 through 10.6.x. OS X 10.2.x-10.6.x is recommended. MasterJuggler is not (at this time) compatible with OS X 10.7 through 10.13.
If your Mac is running Mac OS 9.2.2 or earlier, MasterJuggler Pro 2.1.1 is still available for purchase directly from Alsoft. Please contact our Sales Department to order.
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