I have the same problem. Purchased a few days ago and downloaded the theme from themeforest. No plugins are installed. Is there any quick and simple solution available that does not make it necessary to build the pages completely new in a complicated way? In this case it is time critical also. Would it help to provide you with a temporary admin access? Thanks for your support!

### EDIT ###

Problem is solved. I have no idea how and why… but it works now.