The downloading processes is really a bit confusing for non Japanese speakers. The captcha displays uppercase letters but seems to only accept lowercase letters. If you screw up you get redirected an unrelated page with no apparent hint that you actually screwed up. If you do the captcha right you get directed to a page with a ‘click here to start download’ link. After you click that you get directed to yet another page with a very small link which reads ’こちら’. Once you click that THEN the download finally starts.