To be perfectly honest, I have no idea why it happens, but it happened to me as well on several occasions - it's seems like some sites simply won't accept it. Since it obviously accepts the configuration group part of the statement, just install it manually from the DB. Check the configuration group ID, replace it in the SQL statement and run the SQL from phpmyadmin. Don't forget to add the DB prefix if you're using it. Sorry, but that's the best advice I can give you...
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