Calling XOG is failing with error: 

C:\Program Files (x86)\Clarity XOG\bin>xog -propertyfile clarity.properties

Exception in thread "main" java.lang.UnsupportedClassVersionError: com/niku/xog/client/XOGClient 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 com.werken.forehead.Forehead.setupEntry(Forehead.java:298)
        at com.werken.forehead.Forehead.config(Forehead.java:256)
        at com.werken.forehead.Forehead.config(Forehead.java:131)
        at com.werken.forehead.Forehead.main(Forehead.java:579)
C:\Program Files (x86)\Clarity XOG\bin>java -version
java version "1.8.0_192"
Java(TM) SE Runtime Environment (build 1.8.0_192-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.192-b12, mixed mode)
C:\Program Files (x86)\Clarity XOG\bin>

Release : Any Clarity releases with Java 11 +

• You have to use Java 11 with XOG for it to work (the Java version supported with Clarity)
• Go to Control Panel - System - Environmental variables and ensure you have set up Java 11 in the PATH as well as JAVA_HOME in the environmental variables. 
• Then close and reopen Command Prompt and try again and this should work