ConCen registrations have been closed for weeks.
Nobody noticed except the spammers. They need to register before they even get the chance to pollute our domain, yet they are doomed anyway.
As soon as they post a spam, they are caught. Hell, they can't even register if their email account has been flagged for spamming. But they continue. Relentlessly.
ConCen's core goal - sharing essential information - can be met without registering. You can find and download what you want without ever logging in. It's safer for you, and easier on the site.