I am also experiencing this same issue. I purchased the CS5 Master Collection in 2011 and it is now failing to install updates. My Adobe Application Manager is giving me the same error messages that you are getting. The Customer Support link takes me to the same website. Adobe Support just told me to come on here to find the answers that I seek because CS5 is no longer supported by support specialists. It's pretty discouraging to see that nobody has answered you since you posted this in July.
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