The trial is the Standard Edition.
Total Access Emailer is available in either the Standard or Professional edition. Both versions include the Microsoft Access add-in that lets you create email blasts using your data. The Professional Version adds a royalty-free runtime library and license that lets you automate Total Access Emailer features through a VBA programmatic interface and distribute it to others. More information here.
The Trial Version does not include the programmatic interface or the runtime distribution option. Those options are only available with a purchase of the Professional edition.
A complete list of the trial version limitations is posted here.
Please note that both the Standard and Professional Editions of Total Access Emailer come with a 30-day money back guarantee. If you are not satisfied with a retail purchase of this software product for any reason, you are welcome to return your license purchase for a full refund of the purchase price at any point within this 30 day period.