ho to Set static front page and blog page programmatically in WordPress

You want to make sure the About and Blog pages exist, so create them before if necessary, see wp_insert_post()

<?php

// Use a static front page
$about = get_page_by_title( 'About' );
update_option( 'page_on_front', $about->ID );
update_option( 'show_on_front', 'page' );

// Set the blog page
$blog   = get_page_by_title( 'Blog' );
update_option( 'page_for_posts', $blog->ID );

// Switch to our theme
//switch_theme( 'Template', 'stylesheet' );
?>