First of all I'm running Joomla! 3.6.0 and F2C Lite 5.5-1 & F2C Pro 6.14 (Explanation ahead).
So, after I've found F2C Lite to be what I needed for my website I went ahead with my group and subscribed to the 6 month plan.
I backed up all of the data and installed Pro Version as guided in the documentation through the install package.
The problem happens only when I get to the "F2C Article Manager" where a Fatal Error in PHP occurs (screenshot attached). This is what appears on the errorlog.
<pre class="line-numbers"><code class="language-markup">PHP Fatal error: Call to undefined method Form2ContentHelperAdmin::CreateFeaturedButton()</code></pre>
Let me know if there is anything else you need.
Thanks in advance
Questions and answers for Form2Content, a Joomla CCK.