Upgrade to PRO version

Hello Sakin (I already know you'll answer my question!) I downloaded Catch Everest to have a look at the template as I did with many others. I found it amazing already with all the options you have in the "free" template version. Now the problem is I want more customizing (even if lots of stuff have been done with CSS option). My website is already working (unfortunately not public yet so I cant really give the url) and I wanted to make a simple question: If I upgrade to the PRO version, do I lose all work done until now? or there is a possibility to merge what has been done? Thank you in advance P.S.: I have the latest version installed