You have already imported invent theme zip file.
Inorder to replicate the demo site you have to import the sample data first. The link to the sample data is available in the “Readme.txt” file that comes with the complete download package.
Yesterday i tried to import the sample data in your site but i got an error message while importing. Hope you have already noticed the attachment (error.png).
Mostly the issue is related to the execution time or server memory , your hosting provider will help you to lift the values (post_max_size ,upload_max_filesize,max_execution_time).