I have downloaded both the Java thing (I gather thats some kind of programme that Clash runs on?) and version 4 of the demo in accordance with the instructions. I then clicked on the downloaded demo file and clicked to unzip it with the result that I now have a copy of the demo in my C drive as a "jar" file (whatever that is) {It seemed to unzip itself or am I mistaken? Usually takes all sorts of stuffing around to unzip things}. I have absolutely no idea how to get the demo to run. In other words, how do I open this jar file? I would appreciate advice from some kind soul.
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