For anyone looking for a solution , Problem (Root Cause) :- the below
error means that you ran the jar first with a higher version of Java and
now you are running it with a lower version. Java Runtime (class file
version 53.0), this version of the Java Runtime only recognizes class
file versions up to 52.0In my case I ran the jar first with Java 11 ,
but my cmd picked Java 8 nowadays and I ended up with this exact error .
Solution :- Stop your AEM Jar Remove your lower Java version and upgrade