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LR CC2015 / LR 6 needs a 64Bit OS. If you don't have that it won't be shown.
What is your exact OS version?
If it is 64Bit try to sign out and back in.
This should be 64Bit.
Did you try to sign out and back in from the CC desktop app?
Pause file sync and then check for updates.
Thanks for the help, I had to shut down my Mac, (first time in months) sign back in to adobe and hey presto, Lightroom 6 installed now I can do HDR within the program.