Well it wouldn't download automatically... It would say. ImgBurn has an update. Would you like to download and install, you could then answer yes or no. There are a lot of apps that have this functionality built in.
I'm not sure how hard it would be to implement, but if when a new update came out. Rather than having to manually download it from the site. If the program could grab the update and install the update itself, that would be slick.