Can you please have a try to install WebsitePanel from Microsoft Web Platform Installer 4.6 after having installed it in your system? You will get WebsitePanel Installer from it.
With Best Regards,
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I emailed one of the WSP team members (found their email on the outercurve.org website) and they had the website back up in a few minutes. To quote the reply, "Itís back up. Issue with Word Press. I am working on resolving it."