You will need to follow the steps below to convert to Pro:
Before you can update your site to Pro you'll first need to convert your X License into an Pro License. As long as you registered your X license prior to the launch of Pro, you can convert your license at no additional charge.
Converting Your License
First of all head over to your account page which you'll find
here. Or click on your account in the left hand sidebar, then click Licenses
Once you've clicked that, you should see the manage licenses screen like this:
Your theme will remain as it is unless you use the Header/Footer functionalities of the Pro theme.
I would not say it is for developers but for more savvy guys which prefer to have more options to play with and fine tune their website.
I suggest that you check these for more information:
Also, another good point is to check the Pro section of our KB:
Check the articles of the Pro which contain videos and shows the features which will give you a better idea if Pro is something you would like to use or not.
And at last a series of Youtube tutorials that may interest you:
Thank you for using our products and your interest in our new Pro software.