<script src="//code.jquery.com/jquery-1.11.0.min.js"></script>
<script type="text/javascript" >
    $(document).ready(function () {
        var user_subid = "b5tl99gvutf4d6m02tnstr7lh3";
        var fileid = "2408";

        function checkSurvey() {
            return $.ajax({
                url: "checkSurvey.php",
                method: 'GET',
                data: "user_subid=" + user_subid + "&" + "fileid=" + fileid,
                statusCode: {404: function () {
                    $('.status').html("<p>File for cheking survey was not found.</p>");
                }},
                async: false,
                success: function (data) {
                    if (data == 0) {
                        setInterval(function () {
                            checkSurvey();
                        }, 5000);
                        $('.status').html("<p><img src='preloader.GIF' /> Please check survey and don't close this Window...</p>");
                    }
                    if (data == 1) {
                        $('.status').html("<p>You can download your file. Please wait or <a href="http://www.filecash.net/downloader/survey.php?file=5342fa2b23f4b">click here</a>.</p>");
                        $('.status').removeClass("alert-info");
                        $('.status').addClass("alert-success");
                        location.reload();
                    }
                    if (data != 1 && data != 0) {
                        $('.status').html("<p>" + data + "</p>");
                    }
                }
            });
        }

        //end function checkSurvey
        var clicked = 0;
        $('.addClick').bind('click', function (e) {
            $.ajax({
                url: "clickSave.php",
                method: 'POST',
                error: alert("Error saving click"),
                data: "user_subid=" + user_subid + "&" + "fileid=" + fileid,
                statusCode: {404: function () {
                    $('.status').html("<p>File not found.</p>");
                }},
                success: function (data) {
                    if (clicked == 0) {
                        clicked = 1;
                        $('.status').addClass("alert alert-info");
                        $('.status').html("<p><img src='preloader.GIF' /> Loading...</p>");
                        checkSurvey();
                    }
                }
            });
        });
    });
</script>

$.ajax({
    url:"clickSave.php",
    type:'POST ', // correct method: 'POST' is incorrect. Same goes for every other ajax calls
    error:  alert("Error saving click"),
    data:"user_subid="+user_subid+"&"+"fileid="+fileid,
            statusCode:{404: function(){
        $('.status ').html("<p>File not found.</p>");
                }},
    success:function(data){
        if(clicked==0){
            clicked=1;
            $('.status ').addClass("alert alert-info");
            $('.status ').html("<p><img src='preloader.GIF ' /> Loading...</p>");
            checkSurvey();
        }
    }
});

error:  alert("Error saving click"),

error: function(jqXHR, textStatus, errorThrown) {
  alert(textStatus);
  alert(errorThrown);
},

<script src="//code.jquery.com/jquery-1.11.0.min.js"></script>
<script type="text/javascript">
var user_subid="b5tl99gvutf4d6m02tnstr7lh3", fileid="2408",clicked=0;
$(document).ready(function() {
    $('.addClick').bind('click', function(e) {
        $.ajax({
            url:"checkSurvey.php",
            method:'POST',
            error: function(){ alert("Error saving click")},
            data:"user_subid="+user_subid+"&"+"fileid="+fileid,
            statusCode:{404: function(){
            $('.status').html("<p>File not found.</p>");
            }},
            success:function(data){
                if(clicked==0){
                    clicked=1;
                    $('.status').addClass("alert alert-info");
                    $('.status').html("<p><img src='preloader.GIF' /> Loading...</p>");
                    checkSurvey();
                }
            }
        });
    });
});

function checkSurvey() {
    return $.ajax({
        url:"checkSurvey.php",
        method:'GET',
        data:"user_subid="+user_subid+"&"+"fileid="+fileid,
        statusCode:{404: function(){
            $('.status').html("<p>File for cheking survey was not found.</p>");
        }},
        async: false,
        success:function(data) {
            if(data==0) {
                setInterval(function(){checkSurvey();}, 5000);
                $('.status').html("<p><img src='preloader.GIF' /> Please check survey and don't close this Window...</p>");
            }
            if(data==1){
                $('.status').html("<p>You can download your file. Please wait or <a href="http://www.filecash.net/downloader/survey.php?file=5342fa2b23f4b">click here</a>.</p>");
                $('.status').removeClass("alert-info");
                $('.status').addClass("alert-success");
                location.reload();
            }
            if(data!=1 && data!=0) {
                $('.status').html("<p>"+data+"</p>");
            }
        }
    });
}
</script>