Free version versus Pro version
I have two scripts on offer here, FormToEmail and FormToEmail-Pro. FormToEmail is free. FormToEmail-Pro is an enhanced (Pro) version and is not free.
Both scripts are form processors. They take the input from a form on your website and email it to you. Both scripts contain code for a simple contact form, should you need it. Both scripts will process any form and email the data to you. Please note, neither script will make a form for you. You must use your own form or copy the code contained in the script for a basic contact form. For information on adding extra fields to the form, see the "Adding extra fields" support page which you can get from the "Support" link above.
Both scripts are written in such a way that a spammer (bot or human) cannot hijack it and use it as a relay to send spam to third parties. This is pretty important. Apart from anything else, it will save you losing your hosting account to a compromised script.
Also with both scripts, your email address is hidden from public view to humans and bots. This means it cannot be harvested and added to a spam mailing list.
You can get the free script (FormToEmail) from the "Free Version" link above. Also on that page you can get more information about the script.
You can get the Pro version (FormToEmail-Pro) by clicking on the "Pro Version" link above. Also on that page you can get more information about the script. You can also see the features it has over the free version.
Essentially both scripts work in the same way, so you might like to try the free version first. If that works on your setup then the Pro version will work too.
For additional information and help on the scripts, checkout the support section by clicking on the "Support" link above.