I am sorry to hear that you have been running into issues. I am happy to help out.
I can confirm that I can’t reproduce the same issue on my test site – importing works fine.
I need direct access toyour site’s admin area to inspect further what is blocking you for importing the Logistics demo data. Because it seems likely a site-specific issue.
Please send me a direct message to securely share the username and password to your site’s admin area (/wp-admin). Ensure all administrator rights are enabled.
Have an excellent day