Can't import Enfold 2017 Demo asks to "Restart the page and try again"

Hi team, I need your help with making this demo import work Please! Checked the memory limits – here’s the code:

// Define memory limits.
	if ( ! defined( 'WP_MEMORY_LIMIT' ) ) {
		if ( false === wp_is_ini_value_changeable( 'memory_limit' ) ) {
			define( 'WP_MEMORY_LIMIT', $current_limit );
		} elseif ( is_multisite() ) {
			define( 'WP_MEMORY_LIMIT', '128M' );
		} else {
			define( 'WP_MEMORY_LIMIT', '64M' );
		}
	}

	if ( ! defined( 'WP_MAX_MEMORY_LIMIT' ) ) {
		if ( false === wp_is_ini_value_changeable( 'memory_limit' ) ) {
			define( 'WP_MAX_MEMORY_LIMIT', $current_limit );
		} elseif ( -1 === $current_limit_int || $current_limit_int > 268435456 /* = 256M */ ) {
			define( 'WP_MAX_MEMORY_LIMIT', $current_limit );
		} else {
			define( 'WP_MAX_MEMORY_LIMIT', '256M' );
		}
	}