I use the free version all the time. You don't need the purchased version to customize the form how you want it. Here are some things for customization that I found and that I use every time.
Edit the plug in formidable/css/frm_display.css
add the follwing code to change the font color and style of the labels
you can use any color but for me since I have a light grey background I had to use a dark grey for the labels to see them better.
Also you can add table coding under the formidable / settings / customize HTML.
I added the following in the first box
<table width="700" cellpadding="0" cellspacing="0" style="border:none"><tr><td style="border:none">
and in each box after that just make sure you end with the usual tags to get the structure you are looking for.