10.7.5 to 10.9

unable to update to 10.9 - says up-to-date yet I don't have 10.8

You should be able to upgrade to Mavericks even if you're not running 10.8.x - installing on top of Lion should be fine.
Are you certain that your computer has the necessary resources to run Mavericks? See -> http://support.apple.com/kb/HT5842.
Clinton

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