Runescape Bot Help! don't know how to fix it or get a good free one.?

Yes, i downloaded a bot on a school computer from rsbot.org and it worked great but when i got home and downloaded it, it would not let me play it because i needed a java download i don't know what to do should i try i different one? if you are going to tell me how bots are bad you are just wasting your time writing it!