Use the Updates page to install the 10.9 update or if you would like to download the full OS X installer click Continue.

When I downloaded the OX I still have in the apple store on the OS X "download" When I click again on it I receive the following message : OS X v10.9 is already installed on this computer. Use the Updates page to install the 10.9 update or if you would like to download the full OS X installer click Continue. What does it mean "full" OS X installer?I downloaded already three times the same.

Mac OS X 10.9.3 is the latest released version of the Mavericks operating system.
You can see what you have installed by clicking the apple, left-side of the menu bar, About This Mac and you will see below the Apple logo the installed version of the operating system.
If it is not 10.9.3 and you want to update to that version, then continue with the download and install.
Or, you can simply click Software Update (below About This Mac) and the system will do that for you.

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