(From v.5.0.0)
Back it up. Just in case, you might want to make a backup of the following configuration files:
Get the files. Extract all files to a temporary location on your hard drive. Some files should extract into subfolders called 'admin' and 'English'.
Admin files. Copy all files in the admin folder to the admin folder on your web site (overwrite files with same names).
Database structure changes. In your browser run the script "admin/dbupdate500.php", which should now be in your admin folder. For example, I would run http://www.lythgoes.net/genealogy/admin/dbupdate501.php. Alternately, you can copy this readme file to your site, load this file from there in your browser, then click this link: dbupdate500.php. This will open a new window and make a few database structure changes. You will see a short list of messages detailing what is being done, as well as a message when the script has finished. Your data should not be affected. When this step is complete, I recommend you delete the dbupdate*.php files from your server.
Public files. Copy all remaining files in the temporary location (the ones *not* in a subfolder; see step 2 above) except genstyle.css (the style sheet, because you want to keep your original, with the changes made above) to the main TNG folder on your web site (overwrite files with same names). IMPORTANT: This update should not contain a copy of index.php, config.php, pedconfig.php, importconfig.php or logconfig.php. Make sure you do not copy any of those files to your TNG folder or you will lose your settings or your home page!
The update should be complete. You did it!