The crashing is a difficult one to answer, but the second part of your question is easier. The CC 2014 release was distributed as a separate set of applications so that users can choose which to run (or have both if they want). It's because there are some features and third-party plugins which don't work in the 2014 versions, so if it was released as an automatic update those users would be stuck. You can uninstall the old "CC" versions if you don't need them and all your plugins work fine in the 2014 versions.
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