Xcode 4.2 won't download (thinks it's already installed)

This is a follow up to my previous post, which I accidentally marked "correct answer" but isn't (and, apparently, Apple is not fixing up the undo-correct bug).
So, Xcode 4.1 won't install because it thinks it's already installed and now, when I decided to give up on 4.1 and go to 4.2, I can't even download it.  The app store also says it's already installed.  At least with 4.1 I had tried to install it - and think maybe it's there somewhere but I can't find it (and, now that I've uninstalled 4.0, I wonder if I also uninstalled 4.1 in the process since I used a shell command).  I didn't even download 4.2 much less install it and, if I understand correctly, I should be able to install it, even if I did have 4.0, 4.1 or whatever that existed previously.
Any help?
Thanks!

Question to you ...
I just downloaded and installed Xcode 4.2.1 from the App Store.  The purpose was to enable my engineering software to have access to the C compiler.  After the installation, my engineering software found and invoked the downloaded compiler appropriately. 
However, like a number of other folks, I found that I need to have Xcode 4.1.   Reading various threads it seems that many advise completely uninstalling 4.2.1 first before attempting to install 4.1.
I note that you successfully used:      "sudo /Developer/Library/uninstall-devtools -mode=all"  to remove Xcode 4.2      However, this does not work for me.   From my terminal I don't find a /Developer   directory or folder.   If I go to /Library I don't see /Developer there either.   In fact, I cannot find any "Developer" or "Xcode" folder anywhere, just the "Install Xcode" application.     On the other hand, my engineering sofware still "sees" and uses the Xcode compiler ... so it is here, somewhere.
Would you have any suggestions regarding how to expunge the Xcode 4.2.1?
Thanks much for your thoughts

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