Chaguito - If your proxy requires a user name you may need to put your domain name in also. So if your user name is Chaguito and you log into the SuperDuper domain your user name in the box would be "SuperDuper\Chaguito" then your password if required. Also as Kdyer mentioned any version under 1.5x should be uninstall first. You can also download the 1.50 version, and when you run it select "Uninstall". It will remove most old versions and get it out of the Add/Remove programs. Then you can rerun it and install the new version.
Speaking of I found that little OpenFile Error #5 when you double click a file to open. It doesn't seem to affect opening a file using the File Open, nor does it actually affect anything programming wise. It will be fixed this afternoon.
