Problem in purchasing new license

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Please refer http://www.nagios.org/download/core/

I want to purchase Nagios professional. But i want to try the same before placing an order. I am not sure where I can download Professional edition. In all the places I am able to see only core & XI. Please help me to download and try the same.

[mmiltchev]

Unfortunately there is no trial for Nagios Core Professional.