i can't upgrade my iWork

hello guys,

i have downloaded a trial version of iWork and after checking from iTunes, i noticed that an update for it was available and i updated it. from the iTunes it said that installation was successful but when i tried opening keynote from launchpad the installation process for the trial version starts all over again (but of course i did not reinstall iWork).

thanks

p/s : i have not updated my OS to mavericks since it is a large update and it failed downloading several times. (but im almost there)