That server sometimes changes its URL and/or IP address. If that happens, you can always go to the RegVac page on our website (http://www.superwin.com) and click on the Registered Users section link near the top of the page.
Ray, just a side note but I've tried updating RegVac & A1Click Cleaner, using the http://www.superwin.com, and there is no "Registered Users" link at the top of the page. The bottom half of the red Superwin logo and the other red header at the right top of the page are missing. I just tried again after reading this question with the same results. I WAS able to update using the http://www.superwin.westhost.whsites.net/cgi-bin/registered.cgi?description=regvac link. And I just switched the last word to get the A1 Cleaner update. I would think it was something on my computer but this has happened for months now. Any ideas why??