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Nope, they're not open registration.
Even if they're not quite making some updates in here, you can always ask them directly to chat live support. They're answering on there, the registration will be open for the update new website they're working on it / required you to getting invited by old member
Ognjen-Support: Registration is disabled as we are working on the new platform. On it, access will be possible only via invites by already existing members.
Feel free to ask on there, for more detail.