okay, so at first I had to google "how to run .jar files on windows", then I installed java from java.com or something, and then it just has a dialogue box "a java exception occured" and that is it.
then if i open command prompt and run java -jar EW.jar I get
Exception in thread "main" java.lang.unsupportedclassversionerror: gui/world/worldGUI has been compiled by a more recent version of the java runtime (class file version 61.0), this version of the Java Runtime only recognizes class file versions up to 52.0
I just downloaded and installed the latest java today so, I don't know, you must be from the future or something