I've found a few different articles on it:
http://www.macworld.com/article/2056...all-drive.html
http://www.techrepublic.com/blog/app...s-x-mavericks/
http://arstechnica.com/apple/2013/10...install-drive/
As for downloading the installer if you already have Mavericks installed, the first article says this:
Quote:
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Originally Posted by Macworld
If the Mac App Store won’t let you redownload the installer, quit the Mac App Store app, relaunch it, and then Option+click the Purchases tab in the toolbar; that should show the Download button next to Mavericks in the Purchases list.
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