3.0.3 to 3.0.4 Changed Files 

phpBB SEO Premod 3.0.3

phpBB SEO Premod 3.0.3

Changed Files Package 3.0.3 to 3.0.4

Support for this update package is provided in the phpBB SEO Premod forum.
The phpBB SEO Premod release thread : phpBB SEO Premod V 3.0.4.
Be sure to check this version phpBB SEO premod 3.0.4 released!

Changed Files Package
This update package contains only those files changed from previous versions of phpBB3.
To update with this package, just upload the install/ folder with it's content to your phpBB3 installation root, then need to upload all files within the 3-0-3_to_3-0-4_modified_files/ folder to where phpBB3 is installed.
And browse yourdomain.com/phpBB3/install/database_update.php to end the update procedure.

Translations Update :

This update contain the updated English and French language files.

Please note for update :

This update will not change any of your settings.
If you encounter some difficulties to update the phpbb_seo_class.php file, for example if you modded it, you will just have to use the new file and edit it to re enter your previous customisations (static part & delimiters).
Once you will have updated, you will have to refresh your theme's cache as well as phpBB's cache (ACP => STYLE, Themes => Refresh).

GYM Sitemap & RSS
GYM update process is separated from the premod's one and essentially consist in file upload.
You will need to replace all GYM files with those from the last version (to be found in the root/ dir of GYM archive, just upload all files in root/ in your phpBB ftp directory) and browse the update script (gym_sitemaps/gym_install.php). It will tell you what to do.

IMPORTANT :
GYM sitemaps and RSS is likely to be updated before the premod, it will be up to you to
keep it up to date meanwhile, you can be notified about updates by subscribing to the release thread while logged in :
GYM Sitemaps & RSS module 2.0.RC3