Alright, I tried downloading JRE, but that didn't seem to get me anywhere. I am using a mac currently, so it doesn't look like jarfix will fix my problem? I'd try to post whatever message it's trying to refer to in the console, but honestly it doesn't look like it has a specific message for the error.
Downloaded HD, when I couldn't open the .jar file I was told to download JDK. Now I have both, but all I get is an error message saying I can't launch it and to check the console. Should I download a different program to use HD? Any help is appreciated.