Well, FWIW, PSE 6 does work for me in Yosemite, but it's been pretty common in the past for installed older versions of PSE to keep running after OS X upgrades that have made the installer incompatible. I haven't tried installing PSE 6 in 10.10 so I can't say for sure that that's the problem, but I can definitely run PSE 6 there, so I wouldn't be so sure about that just yet.
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