Hi, welcome to the forum and thanks for your feedback!!
If you want to install the latest version of mGalaxy you'll have to install it again (sorry, but too many differences with the previous version).
Think to backup your precious 'favorites.ini' file for each of the platforms you're using! (this file contains your 'favorite list' and can be found in ( your mgalaxy folder) > data > (the specific platform)
If you already have the latest version installed you'll just have to install the 'supporter edition' theme over it! (It's done automaticaly by the way)
Don't hesitate to come back here if you need further assistance!