MDaemon does not send the trial key
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I am currently using MDaemon version 18.0.2. During installation, I registered my email address to receive a free 30-day trial key. However, the email I received was not the trial key — instead, it was a message asking me to install the MDaemon application, even though I have already installed and set it up and am ready to use it.

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Why are you wanting a trial version of MDaemon 18? That version is approximately 8 years old.
The email is saying that if you'd like to trial MDaemon, you need to install the latest version. You can download the latest version from https://mdaemon.com/pages/downloads-mdaemon-mail-server-free-trial