SmarterMail comes as a single installation file that contains everything necessary
to run the product. The SmarterMail installer can be downloaded from http://www.smartertools.com. Both the free and the licensed editions of SmarterMail are contained within this installation file, so it is not necessary to download or install the file again if you purchase a license
after trying the free edition.
Please refer to the KB article How To - Install SmarterMail for step-by-step installation instructions.