Using Win7, just downloaded calibre. I get a message that says that "Newer version of calibre already installed. If you want to downgrade you must uninstall calibre first." How can anything be newer than the current version? I don't have calibre in my Control Panel/Programs to uninstall. Apparently I had installed it before, since I do have a folder named C:/Users/Me/Calibre Library with dates of about Oct 2011. In my downloads folder, I still have calibre-0.8.22.msi. That file will not install either.
Any pointers?
