600USD ahead of time for just one EX4 decompilation? Seems like rip-off for me. If will not work, they won't Provide you with money back. This app is not really a decompiler, It can be just let you know to pay and send out the EX4 by way of e-mail. https://finneihdz.blogacep.com/35838175/getting-my-ex4-to-mq4-converter-to-work