download.php 를 수정합니다.

4번라인에
function download_header($filename, $mode = "write", $filepath = "") {
if(strstr($_SERVER['HTTP_USER_AGENT'], "MSIE")) {
$filename = rawurlencode($filename);
$filename = preg_replace('/\./', '%2e', $filename, substr_count($filename, '.') - 1);
}

header("Cache-Control: ");
header("Pragma: ");
header("Content-Type: application/octet-stream");
header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
if ($mode == "write") {
$file_size = 0;
}
else {
header("Content-Length: " .(string)(filesize($filepath)));
}


header('Content-Disposition: attachment; filename="'.$filename.'"');
header("Content-Transfer-Encoding: binary\n");
flush();

}
를 추가합니다.

if(preg_match("/msie/i", $_SERVER[HTTP_USER_AGENT]) && preg_match("/5\.5/", $_SERVER[HTTP_USER_AGENT])) {
    header("content-type: doesn/matter");
    header("content-length: ".filesize("$filepath"));
    header("content-disposition: attachment; filename=\"$original\"");
    header("content-transfer-encoding: binary");
} else {
    header("content-type: file/unknown");
    header("content-length: ".filesize("$filepath"));
    header("content-disposition: attachment; filename=\"$original\"");
    header("content-description: php generated data");
}
header("pragma: no-cache");
header("expires: 0");
flush();
부분을 주석처리또는 삭제하고
download_header($original, "", $filepath);
를 추가합니다.