We need some clarification, there is no Lightroom Classic 2015 v6.
Please check the "About Adobe Lightroom Classic" in the menu bar and indicate the specific version you presently have installed.
The latest version of Lightroom is Lightroom Classic CC 7.1 the latest version of Lightroom CC 2015 is version 2015.13.
See the screen capture for the system requirements for Lightroom Classic CC if you need to run this version then you will have to update your operating system to at least. OS X 10.11.
Yes, if you upgraded to 6.14, it won't run under your operating system. I believe that 6.6.1 is the latest version that will run with your operating system (but you should really check the system requirements on this matter). So the solution is to either upgrade your operating system, or downgrade LR to the version that runs on your operating system.
Quote "2. Lightroom encountered an error when reading from its preview cache and needs to quit."
This is a separate issue and indicates that your previews files have become corrupt. You can delete your previews files and when you open the catalog again the previews will be rebuilt.
The previews files folder is located by default in your User files(your name) > pictures > lightroom subfolder and sits alongside your Catalog file which ends with .lrcat (LRCAT). The previews file has the same name as the Catalog file but ends with .lrdata (LRDATA).
For safety you can first rename the .lrdata file to create a backup then delete the file.
Do not delete the .lrcat file or any other files in the folder.
See the screen capture.
Thank you for your reply, I tried what you said but it still gives the same error messages.
The version of Lightroom is Adobe Lightroom build  (6.14), according to Adobe Creative Cloud it is Lightroom CC 2015. Because of the errors wanting to close the program I cannot get any further information, its all greyed out.
The problem report is as follows:
Process: Adobe Lightroom 
Path: /Applications/Adobe Lightroom/Adobe Lightroom.app/Contents/MacOS/Adobe Lightroom
Version: Adobe Lightroom  (6.14)
Code Type: X86-64 (Native)
Parent Process: launchd 
Responsible: Adobe Lightroom 
Date/Time: 2018-01-21 23:27:50.494 +0000
OS Version: Mac OS X 10.9.5 (13F1911)
Report Version: 11
Anonymous UUID: BEAB505E-C8E2-7FD0-2245-DB89C4F11B6F
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x00007fff96a45dd0
VM Regions Near 0x7fff96a45dd0:
Submap 00007fff759d3000-00007fff80000000 [166.2M] r--/rwx SM=PRV process-only VM submap
--> Submap 00007fff80000000-00007fffc0000000 [ 1.0G] r--/rwx SM=SHM machine-wide VM submap
unused shlib __TEXT 00007fff83168000-00007fff8318a000 [ 136K] r-x/r-x SM=COW system shared lib __TEXT not used by this process
Application Specific Information:
objc_msgSend() selector name: maximumLengthOfBytesUsingEncoding:
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
There is a lot more and I have removed the user ID info above.
dj_paige has suggested v6.14 will not work on my current version of MacOS, I had hoped that the automatic updates would recognise the version of OS that we are using.
I would be grateful for any further thoughts, if dj_paige is correct how do I get back to a version that did work?
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You will not be able to run Lightroom 6.14 with your operating system.
The only solutions are to upgrade your operating system to OS X 10.11 or later, or downgrade Lightroom to 6.6.1