So I looked at unity editor usage (from analytics). Thought that might be useful in deciding which unity versions to support in your AS packages. Here's data from last month (2015 Sep 16 - Oct 16), excluding sessions from beta versions. OS share is 83.5% Windows, 16.5% Mac.
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Older data from 2015 July:
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Older data from 2015 March:
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Older data from 2015 July:
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Older data from 2015 March:
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