Hello,
An internal Server Error is not an error of a theme. It’s a server issue. Moreover, a WordPress theme demo does not work like you are thinking it could send through FTP.
Please let us know your hosting server’s PHP version, Memory Limit, and Maximum Upload File Size.
PHP version: We recommend PHP 8
Memory Limit: We recommend at least 1024MB to import correctly.
Maximum Upload File Size: The largest file size that can be uploaded to your WordPress installation. We recommend at least 1024MB.
Please check and fix those server issues and run the importer again to import the demo data.
Best Regards,
ThemeLooks Support Team