java version "13.0.2" 2020-01-14
Java(TM) SE Runtime Environment (build 13.0.2+8)
Java HotSpot(TM) 64-Bit Server VM (build 13.0.2+8, mixed mode, sharing)
PATHenvironment by default. You might have missed some checkbox that reads "Add Java to PATH" or "Set JAVA_HOME" when installing the JDK or the JRE.
JAVA_HOMEvariable. Check the Set Environment Variables section of this guide for an idea of what you need to do.
java -jar KoLmafia-[whatever].jar
I navigated to the directory with the Kolmafia jar, highlighted it to select it, used a right click and brought up the menu. Open at the top should be bold. If it isn't try and open the jar file and it should ask you to pick a program which should be java.Windows 10 doesn't seem to give me an open with, any suggestions?