InstaWP - Update temporary directory.

functions.php

<?php

add_action( 'admin_init', function() {
	// Get Simply Static options.
	$options = get_option('simply-static');
	
	// Check if directory exists, if not, create it.
	$upload_dir = wp_upload_dir();
	$temp_dir   = $upload_dir['basedir'] . DIRECTORY_SEPARATOR . 'simply-static' . DIRECTORY_SEPARATOR . 'temp-files';
	
	// Path correct, exit.
	if( $options['temp_files_dir'] == $temp_dir ) {
		return;
	}

	// Check if directory exists.
	if ( ! is_dir( $temp_dir ) ) {
		wp_mkdir_p( $temp_dir );
	}
	
	// Update the path.
	$options['temp_files_dir'] = $temp_dir;
	update_option('simply-static', $options );
} );