hey thanks for your replay. I found a issue. And got file downloaded. As I'm using my vodafone connection all the time and there is that image compression or something http://18.104.22.168/bmi-int-js/bmi.js at the beginning of source. I went back download zone same as link and I continued to trying and it still failed and gave me same error. Then one of times I happened to go with mouse over the captcha image and it had ALT shift+r proves image. So I pressed it and captch picture chanced and download was successful.