I tried updating my Live wordpress site to the latest wordpress version (v4.7) and i encountered some issues

If the update wasn’t completed, you can finish it manually. Download the latest version of wordpress from https://wordpress.org/download/. After this, remove wp-admin and wp-includes folders and upload via FTP everything from the archive, except wp-content. Be sure to rewrite existing files.

To complete the update, go to your wp-admin and do the database update.

P.S. If there is a .maintenance in the root folder (probably public_html), remove it so the site leaves the Maintenance mode.