How can I install Mavericks a second time?

I tried installing mavericks and got the disk corrupted error. I found I couldn't fix it, so I tried installing again this time onto an attached hard drive. This sort of worked, and allowed me to run diagnostics on internal hard drive ( it's fine ). Now I want to install Mavericks again on the internal hard drive but when I boot from the internal drive ( again, it's fine ) Software Update ( App Store ) tells me that Mavericks is installed on my 10.8.5 OS computer and won't let me do anything to fix that.
What I want to do is update my internal drive and use that to boot from. It's not apparent how I can do that. Any help would be appreciated. Thanks!

The Mavericks installer should be located in your Applications folder. If it's not there anymore open App Store. Go to "Purchases" and click on the "Download" button next to Mavericks.
Disconnet the external drive. That's why you're getting the message that Mavericks is already installed.

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How can I install Mavericks a second time?

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