Changed Files 3.0.RC5a to 3.0.RC7 

Backing up all forum files and the DB before you proceed is more than required.

phpBB SEO Premod 3.0.RC5a

phpBB SEO Premod 3.0.RC5a

Changed Files Package 3.0.RC5a to 3.0.RC7

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.RC7 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 and browse yourdomain.com/phpBB3/install/ to start the update procedure.
You'll then need to upload all files within the RC5a_to_RC7_modified_files/ folder to where phpBB3 is installed.

Translations Update :

Only the English language pack is included by default in the auto update and changed file package.
Both update package comes with a translations/ folder.
In case you are using the french language pack, you'll just need to copy all files in the translation/ folder to the RC5a_to_RC7_modified_files/ folder before you upload all files.

The update will not require any additional set up or .htaccess update. Your forum URLs will stay exactly the same.

Make sure you clear phpBB3 cache after you're done with updating (all files within the phpBB3/cache/ folder BUT the .htaccess).