In case this might help someone, I found a solution to the problem I was having upgrading LR CC. Sure enough, this is a common problem and Adobe Support eventually published a fix at https://helpx.adobe.com/lightroom/kb/unable-launch-lightroom-55.html that involves renaming two different program files in different places so that the new program isn't looking for them. Simple to follow instructions. This came after a week of switching to a new user profile to run LR CC at all. First world problems... but I find it kind of weird that their telephone support experts couldn't help me figure this out.
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