Hello,
Sorry for the delay in answering.
Do you want to run a full demo version import? I can see some content on your site, but It is recommended to run import on a fresh WordPress installation. For this you can use WordPress Database Reset plugin https://wordpress.org/plugins/wordpress-database-reset/ The plugin can be used to remove all the existing content and install a new version from scratch. It is recommended to disable the theme https://prnt.sc/unle03 before the reset.
So do reset the current content, and do the import of the desired demo, before activations 3rd party plugins.
Regards