ATTENTION;ALL EAs IN ONLINE LIBERARY DOES NOT WORK IN LIVE TRADING,WHY

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HELLO PROS, IM A NEW BIES AFTER STUDIES HOW TO USED EA AND HOW TO TEST IT, I DOWNLOAD SOME EA FROM THE ONLINE LIBERARY AND ATTACHED IN MY CHART BUT IT DOES NOT WORK, WHAT HAPPEN, DO WE HAVE SPECIAL EA FOR SPECIAL CHART OR WHEN SOMEONE CREATE AN EA ITS FOR A PARTICULAR PURPOSE OR DO WE HAVE SOME EAs FOR TESTING AND SOME FOR LIVE TRADING, ANY BODY TO HELP