Means they just updated Runescape(jagex did) the bot is outdated, the owners have not been made aware, but will be and post an announcement probably within a few hours.
it says checking for update than installing update, when its saying that do not click away from the little screen you get or else it will stop responding instead wait awhile til it says it downloaded, close it, than, install it, than run again and you should be good to go
Everyone that posted above is incorrect, even though they are on the right path. It's because the update happened, everyone closed their bot client, and thousands are trying to open their client at the same time, so it freezes. If you let it load for 10 mins or so it should work.