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I have my wife's phone that I'm trying to see if i could Root. She currently has Ver 1.705.605.0 which i understand theres no root for this Ver.
Can i downgrade the Ruu then Root it?

your version doesnt make sense. the most current version(mr2) is version 1.70.605.0. assuming you just have an extra 5,you have understood incorrectly
the manual method techincally does still work with this version just fine if you want to do it that way.
the best,fastest,and easiest method of rooting currently is this: Revolutionary
there are a couple other threads about it on this first page (alpharev/unrevoked is here! is one of them)
does it revolutionary do macs?
I don't think so there is a manual root method for Macs however