I was notified that there was an update to Lr CC, and once I clicked install, it won't go past 42%. After that, it says that the installation failed, and I'm not sure what options I have.
Sounds like you might be having difficulty with Adobe's Download Manager app... Try using the Lightroom 6/CC direct links instead:
Download New Adobe Lightroom 6 (CC) Free Trials – Direct Links
Hopefully with those you'll be able to get farther.
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