Thanks for posting on Adobe forums.
Could you please try updating to latest Lightroom version 6.6 manually.
Download link for MAC:- http://swupdl.adobe.com/updates/oobe/aam20/mac/AdobeLightroom-6.0/6.6/setup.dmg
Let us know if that helps.
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- Please use Adobe Cleaner to uninstall Lightroom 6.Refer Use the Adobe Creative Cloud Cleaner Tool to solve installation problems
- Then reinstall Lightroom.
- Download link:-Install Photoshop Lightroom
- Try updating.
I tried to follow the instructions, but LR6 is still there. I do NOT have the CC version, I have the stand alone - it did not show up in the CC Cleaner list.
and now my Adobe lightroom uninstaller seems to have disappeared.
I have nearly the same problem on my iMac - I can not update Lightroom. The main difference is I have the Creative Cloud (CC) and can not upgrade beyond Lightroom 2015.1.1.
To remove your Lightroom 6, try using AppCleaner It searches your Library etc to remove all associated files giving you a clean slate... hopefully.