Hey Guys!
We’re sorry you are having these issues, whenever this comes up with demo import it is 100% due to php configs. And sometimes you have to reset the server for them to take the new configs.
Here are the recommended values: https://theme-fusion.com/knowledgebase/what-to-do-if-xml-import-fails/
As long as those values are set and your server is using them, the content will import. The content importer simply sends all the data to your own server, the only thing taht can go wrong is an issue with the server receiving the data.
Our team can take a look for you, please post a new ticket with our system. You can also use the plugin mentioned in that above post to verify the settings on your server.
https://theme-fusion.com/support-ticket/
Thanks, we hope to see you on our support site!