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Question: Startup drive for 10.11.5?

I am running OS 10.11.6 on an early 2009 Mac Pro 4,1. I need to roll back my OS to10.11.5 because my CalDigit Raid stopped working. Can I download 10.11.5 and make an external startup drive? Unfortunately, Time Machine is not an option. The App Store downloads El Capitan 10.11.6 only.

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Question: Startup drive for 10.11.5?