...(the .exe file won’t use your pre-installed jre, I will find a solution to that and I will update this folder) The .jar file will try to use a preinstalled version of java (jre) if you don’t have it then you need to download the customjre or one from the official website. Then you need to open Terminal/Command Prompt and do “dir of customjre” -jar “dir of the jar” you can try to put that into a runnable file on your os to make it run when you double click the new file you’ve created.