Yes. But you will still have LR 5 on your system. LR CC/6 does not overwrite any older version of LR. It is a brand new program and installs in its own folder.
Good to know, thank you. Then I could use my existing library as-is if LR CC didn't work out.
Are you aware of any problems with LR CC on Mac's?
Yes. The install of LR CC/6 does not touch either the LR 5 program or the LR catalog file. It will copy your LR 5 catalog and convert it to a LR 6 catalog but it won't touch either the LR 5 catalog or program files. They will both still be available if you so desire.
Are there problem with Mac and LR? Probably in some way. Don't know as I stopped using a Mac or any Apple product well over a year ago.
But 99% of the time it is either user error or some type of hardware problem. Also the one thing you should do is uncheck, turn off, the option to "Use Graphics Processor" in the performance section of the LR preferences. It doesn't work properly on 90+% of systems.