Please open the activity Manager in Mac and close the creative cloud desktop app, once done reopen it and try the update again.
Let us know the Lightroom version you are using and Photoshop CS6 maximum supports ACR version 9.1.1 only.
This worked! Thank you! I force quit every adobe process, and then a few "cloud" processes that didn't seem to be part of apple or anyone else's program. It didn't work at first, but then i rebooted and force quit the same things again, and it worked! i updated to the latest Lightroom (June 2016 update version 6.6) however i still have the error message about camera raw when i try to use "edit in CS6".
Lightroom is 6.6, it's using camera raw 9.6
CS6 is 13.06 x64 using camera raw 126.96.36.1991
Is there a way to roll back lightroom's camera raw so they are both using 9.1?
You can roll back the Lightroom to 6.1.1 version for ignoring that message.