Forum Thread: How to Os 10.10.10.10.and 10.10.8 Dual Install.

How to Os 10.10.10.10.and 10.10.8 Dual Install.

Got a new mac pro with yosyosamite. Since some of my sift wares will run in 10.10.8 only how can I have both the os or should I downgrade to 10.8

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