I have Mac lion and I have Xcode 4.2 installed (downloaded from appstore for free).
Today I wanted to upgrade to 4.3.2. Then I searched Xcode from appstore, on the Xcode page, it says "Free", then I click on free, the button turns to green with text "Install App".
After click "Install App", it start downloading, but it's so slow and I had to take the computer out for a while, then I paused the download and shut down the computer.
Then, after I came back, when I return back to appstore, there's no resume downloading. When I search Xcode again, on the Xcode page, it says "Free", when I click on "Free", the button turns into Gray with text "Install", when I click on "Install", nothing happens.