When you have a previous installation of MegaGlest installed and are in the process to install a newer version, you will be prompted as to whether you would like to uninstall the old version. If you select not to uninstall the old version, the default installation path is that of the old installation. As such, users who go this route and just click on 'continue' will end up (partially) overwriting their old installation, shooting themselves in the foot a little too easily (and experience tells that Windows users love to do this).
So we should make it a little harder for them and not offer to install an updated version to the same directory in the first place, In other terms, we should probably either unset the default installation path in this case, or force them to uninstall the old version when using the installer.
