Thanks you for the screenshot. It looks like you have downloaded the file as a .zip not a .jar. I suspect that you do not see the .zip because you have file extensions hidden in you windows preferences. (learn how to turn them on here) Now this is sometime caused by using internet explore to download the .jar file as per this article. (this was the first one to come up on google don't take it as an offence). So if you where using internet explore try a different browser to download or turn on extensions and change the .zip ending to a .jar (so the fun name is "soartex-patcher_1.1.jar")I did that. It looks like this:
It's telling me it's a zip even though the filename is .jar and the default opener is java. The exception was what I thought it was, "Could not find main class Sortex-Patcher_1.1.jar.zip."
Now if my guessing is completely wrong let me know any more details about what you are doing. It might just be a bug that I need to go fix.