There was a bug in the last few versions of BTConvert that caused it to believe that the last update was less than 5 minutes ago even though it wasn't. So it would ask for confirmation every time you clicked the manual update button. I was too bored to fix it so I removed that feature but added one more. To avoid closing and reopening the program (which means that you'd have to wait for the startup exchange rate update) BTConvert now will hide in the notification area of your tray and keep updating the rates in the background. So you may as well put it in your computer's startup!
Here is the new version.