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Is it possible to log in using the old data without re-registering?
The problem is most likely due to this:
Sorry, this user has disabled email reception. If you need to send a message to this user, please contact the administration; they will be able to help you.
In short, there is another form in case he doesn't remember either his password or the email address he used for registration. If that doesn't work, he can write his email to me or to the Creator.