Demo Import Not Working

I have all of the PHP settings set up beyond the recommended settings and the import is still not working. Please help. I need to get this installed for my client. There is nothing that the hosting provider can do. All of the settings are maxed out.

max_execution_time
300

max_input_time
-1

memory_limit
512M

post_max_size
128M

upload_max_filesize
512M

Thank you.