[lyzardqueen]

I was downloading the latest update and I think I tried to launch it before the download was complete. Now the process will not complete. I can neither install nor uninstall the program: all I get is an error message - "An installation for calibre is currently suspended. You must undo the changes made by that installation to continue. Do you want to undo those changes?" - but clicking yes does nothing, I just get the error message over and over. Please help!