Need help updating from 0.9.2 to 0.9.3b

you will have to uninstall 0.9.2, then install 0.9.3b from within the directory you unzipped "a bunch of stuff". From that directory do a ./install_fritzing.sh. You then have to use the file also in the directory with "a bunch of stuff" and use the file named Fritzing.

You can also create a shortcut using a menu editor pointing the shortcut to the Fritzing file in the directory.

Hope that is not too confusing.