cannot import sample data and also there is not a customize option.
The server was getting problem so customer can not import data.
The demo data is already for your import now. You can try again.
If the problem is still remain, please provide an admin account so i can help you check it.
We are sorry for this inconvenience.
I checked your server environment and see it does not meet our requirements to make the theme work:
Please refer this article for more details:
I can help you import demo data from us but all exist data will be reset. You need to change admin later by your self.
But before do it, please check your site info again:
Please confirm so i will help you import.