Why can not I save custom message in notification rule?

Why can not I save custom message in notification rule?

Hello!

I downloaded and installed SupportCenter for windows. I enabled 30-day trial for Standard version.
Next I tried make my custom message for e-mail notification, but I can't save it. When I press "Save" button, nothing to do. Other buttons as "Cancel" work properly.

Is there any limitation for trial version of this software?

Thank you!

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