Is Xcode 4.1 still downloadable from someplace?   How to expunge Xcode 4.2.1?

1)  It seems that at the App Store only Xcode 4.2.1 is currently available.    Does anyone know from where Xcode 4.1 might still be downloadable?
2)  I have also read in several threads that if one wishes to install Xcode 4.1 after Xcode 4.2 is in place, then one is best advised to expunge Xcode 4.2 first.   This has been done successfully by several people using  "sudo /Developer/Library/uninstall-devtools -mode=all".   Unfortunately, this did not work for me.   It seems that there is no /Developer   directory or folder for sudo to access ..... yet, the Xcode 4.2 C compiler that was installed (somewhere unknown) is still accessible to my engineering software.    Bottom line, Xcode 4.2 stuff still exists on my machine, but I cannot find or erase it.
Any recommendations?
Thanks much

Thanks very much K T.  Unfortunately, I need Xcode 4.1 because it has a compiler required by MathWorks SIMULINK dynamic model simulation software.  I tried to use the compiler in Xcode 4.2.1 and the compilation aborted.  MathWorks explained to me that they do not support the newer compiler. 
I believe that I could install 4.1 I would be in good shape.  However, in reading various threads, I am concerned that I should not attempt to install 4.1 without getting rid of 4.2.1
Would there be a better way?
Thanks

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