Before attempting an upgrade, ensure that you've made a fresh backup of both the database and the phpList files. Specifically, you'll want to ensure you have a copy of config/config.php
and any other files that you've manually changed.
Download the latest version of phpList from http://www.phplist.com/download. Extract it locally and then upload it to your web server, overwriting the existing files.
Once the upload is complete, either copy config/config.php
over verbatim (for a minor update) or re-customize config/config.php
using your backed-up copy as a sample.
Load the admin page in your web browser. A message will warn you that your database is out-of-date. Click on the upgrade link:
You will be presented with a confirmation message explaining the upgrade process. Click on the word here to start the upgrade. This may take some time, depending on the size of your database:
Upon completion, you will see an Information: Success message:
To confirm that the upgrade message...