Pb installing lightroom 5

hellos
i have just recently subscribed to Photoshop/Lightroom CC and was running a Mac os 1.6.8. Lightroom would not install so i had to upgrade to a newer version of OS, and upgraded to Maverick. Still, i cannot install light room. This time the Adobe App Manager doesnt give me an Error 7 as before, just says there were errors and installation failed. When i click  on "more details" it opens a page in Safari to this address : file:////tmp/50415809-D9DB-4673-9061-329684992018/Summary.htm
which doesnt produce anything.
So: what's wrong ?? and how to install LR ??
Help much appreciated, thanks

Do you have any other Adobe Creative software currently installed?  You may also want to try installing under a new Administrator account.  Please see Install or run Adobe applications in new user account | Mac OS X - http://helpx.adobe.com/x-productkb/global/install-or-run-applications-new.html for additional details.

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