Logitech confirmed this does not work with Yosemite 10.10
Despite listing this app as compatible with Mac OS 10.7 or later, Logtech customer support just confirmed that it DOES NOT work with Yosemite. Their wording:
"Unfortunately, the Logitech Camera Setting is only compatible until Mac 10.9.” - Logitech customer support email.
Come on Logitech, you have had enough time to update the software! Shoddy support.
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Logitech Camera Settings