Shut Off Update notifications

I've been using Fences 3.03 for about a year now and I'm quite happy with the way it works. For the past few months I've been getting notifications for an update, which I really don't want to do. As I said, I'm happy with it, so if it ain't broke (for me), don't fix it. Where is the setting to turn off the update? It pops up often and at some really bad times, like when I'm playing a game, it will take me out of the game to the desktop. It's getting annoying.