I re-downloaded it (saved it) and tried to install it. Now, after trying for a while, it just says "unable to install". I have Python installed and PyGTKEditor. Also lots and lots of other progs installed. Because of the unhelpful installation error message, I don't know what to think.

OK I tried again, but this time, instead of saving the deb, I just opened it directly with Application Manager. Once again it says corrupted file.