Doesn't seem to open

[quantumcore]

Doesn't seem to open

[quantumcore]

I think the java version you installed is not compatible.

Lets see what the error is, Can you open cmd and navigate to the RHP directory.
Then type java -jar RHP.jar and paste the output here?

Thanks for your reply, yep, what you said was the issue. I was a bit confused by Java 11 downloads (could originally only find a zip of files and not an exe) so just downloaded the latest Java 8, where the error below is from. I did some more digging and tried a Java 11 exe download from outside of the Java/Oracle website and it then worked fine, thanks! Unfortunately the features set isn't quite what I'm looking for at the moment, but glad to know this works and I'll keep my eyes on any future updates! :D

Exception in thread "main" java.lang.UnsupportedClassVersionError: rhp/MainWindow has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader.main(JarRsrcLoader.java:59)

[quantumcore]

Don't give up just yet, Install this and try again. I guarantee you it will be worth it.
https://www.oracle.com/java/technologies/javase-jdk15-downloads.html

[graysuit]

In my case, I was using java.exe of jdk. Instead I should usejava.exe of jre.
I thought that its version problem. But actually its java runtime problem.
Now it works fine.