PIONEER DJ DDJ SX2 FIRMWARE UPDATE

I PURCHASED A PIONEER DDJ SX2 RECENTLY AND I TRIED TO UPDATE ITS FIRMWARE TO THE LATEST VERSION. I DOWNLOADED THE UPDATE FILE ( JAR FORMAT) AND FOLLOWED ALL STEPS WHAT IS FOUND IN PIONEER WEBSITE AS IT SAID..

PROBLEM IS I WHEN I CLICKED ON UPDATE FILE( JAR) , INSTEAD OF UPDATING THE FIRMWARE IT GOES INSIDE THE JAR FILE AND SHOWS THE CONTENTS OF THAT FILE..I TRIED WITH DIFFERENT TYPES OF ZIP/UNZIP SOFTWARES BUT PROBLEM STILL THE SAME.

MY LAPTOP IS WINDOWS 8.1, 64 BIT.. IF SOMEONE COULD EXPLAIN ME HOW TO GET IT DONE ITS A GREAT HELP...THANKS..