java - Unsupported major.minor version 52.0 while trying to run an exe file

GP is a .exe file that I downloaded from here. When I'm trying to run it, I receive the following error:

C:\GPP> gp -list
Exception in thread "main" java.lang.UnsupportedClassVersionError: pro/javacard/gp/GPTool : Unsupported major.minor version 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$1.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)


C:\GPP>

How can I handle it? Should I remove JRE and install a newer or older version?

My Current version:

C:\GPP> java -version
java version "1.7.0_21"

Java(TM) SE Runtime Environment (build 1.7.0_21-b11)
Java HotSpot(TM) 64-Bit Server VM (build 23.21-b01, mixed mode)

C:\GPP> javac -version
javac 1.7.0_21

C:\GPP>

Is it possible to force Java use an specific major.minor version to run a program?

Answer

You need to install a Java 8 runtime as the application you downloaded was compiled with Java 8 as target platform.