Потому что в RC1 дыру нашли. Вот сообщение.

We have identified a critical security bug in RC1. Please upload the attached files to your board as soon as possible (they go in your main forums directory).

Additionally, recent registrations may have a problem logging in with the new code; this is an intentional effect of the code. Simply have them request a new password.

Note: RC1 downloads have been temporarily disabled. They will become available again as soon as possible. We apologize for any inconvienence.

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