The new version is simple to install and upgrade.
If upgrading you should backup first. Backup your database, and there are two files you should note:
The original "config.inc.php" file can be retained as is. But ensure you check the "constants.inc.php" file for new or changed constants (edit as required).
You should upgrade as the new version includes important version checking methods to ensure your installation is kept uptodate.
Any problems let me know...