could not use Onelove themeForest

I purchased OneLove - The Elegant & Clean Multipurpose Wedding WordPress Theme from Evanto but could not use it after uploading even following all instructions. Pls advise. It’s too complicated steps to find support from the author.

What’s the actual problem?

After uploading, the page builder doesn’t work. No page builder there allowing me to change anything of header, footer, logo…

This is an item by Catanis. How can I get supported by them?

Almost certainly this is just confusion during setup but author support it here Catanis Themes Help Desk