I have same issue,

i tried to import all demo load properly but not for enfold 2017, it says “Importing didnt work!
You might want to try reloading the page and then try again “.

i have tried click import button and refresh page many time stil eror.
i have define(‘WP_MEMORY_LIMIT’, ‘256M’); but nothing happen.
i have tried WordPress Reset many time and still not resolve.

https://pasteboard.co/I8fo8zl.png
https://pasteboard.co/I8for5T.png