CompleteFTP comes in four editions: Free Edition, Standard Edition, Professional Edition and Enterprise MFT.
A comparison of the four editions can be found here. The trial installer will start you off using Enterprise MFT, but you can easily downgrade and upgrade between editions in the Licensing panel during the trial period.
The differences between the editions are shown in a table here.
Note that CompleteFTP is licensed on a per machine basis, i.e. one license is required for each machine it is installed on, unless a Universal Activation Key (UAK) is purchased. This permits installation on any number of machines in the organisation, and online activation is not required. It is available for certain Volume Licenses, on request.
Upgrading
If you have purchased the Standard or Professional Edition but subsequently decide that you require the features of a higher edition, you can upgrade for the cost of the price difference plus a USD 30 administration fee - please contact us to arrange this (and include your purchase reference in your email).