I uploaded the files and then re-uploaded them after the error.
The update page is showing raw code and the final line reads.
Fatal error: Call to undefined function: wp_redirect() in /home/deanlog/public_html/blog/wp-admin/admin.php on line 8
On that line is
wp_redirect(get_option('siteurl') . '/wp-admin/upgrade.php?_wp_http_referer=' . urlencode(stripslashes($_SERVER['REQUEST_URI'])));
It seems that some include file is not working.