So I'm trying to update a game. I started the download 13 hours ago, and its not even halfway, because the amount it has downloaded keeps jumping around. One second its on 45% the next its at 15%. Please help!

Sometimes the progress bar may jump around due to it transitioning into extracting or patching the game. It's hard to accurately predict total % when multiple things are happening in parallel. We're aware of this bug though and the jumping should be fixed in the next major release.