Is it possible to install your 1.0.2 IDE package in a location other than \Program Files\Arduino?
When I move the installation to another directory (\Arduino) the IDE complained it couldn't find avr-g++ (even though the path it showed was in fact correct after moving the directory). I assume there is some registry value that is causing issues?
It gets quite confusing with multiple location of the sketches directory and the libraries directory when you have more than one version of the IDE installed.
Ideally I'd like to be able to specify a directory for "libraries", in the same way you can now specify the "sketches" dir. This would mean that I could maintain all my source user-level directories independently of particular IDE installations.