To use the .Rar file.. Change the JDK in the "Run" File to your JDK version, by editing the "Run" File. To find your JDK go to "C:\Program files or Program files (x86)\Java\jdk''yourversion''\bin\

it will probably look familiar to:

C:\program files\java\jdk 1.8.0_20(depends on your version)\bin

copy this and paste it into your run so its like this:

''C:\program files\java\jdk1.8.0_20\bin\java.exe''

mak sure to have the [''] before and behind it too and end the java with .exe!

have fun playing the rar.