App Store keeps re-downloading same app

I am running OSX Yosemite 10.10.2.

I am trying to update iTunes to 12.1.2. The App Store downloads the update, and it shows under "Updates installed in the Last 30 Days".

But, iTunes is not updated! When I launch it, it asks if I want to update!!

When I go back to the App Store, it tells me "again" that there's an iTunes update, and starts downloading it again!!

Same goes for the Yosemite Recovery Update 1.0 available now.

I took a screenshot

Can anyone help please? This is driving me crazy!

You need to download the Yosemite update first. Download and install 10.10.3 and then afterward download and install the iTunes update.

Thank you very much. I will try that.