Do I need to install extra patches afterwards?

Yes.

The SP15 package incorporates updates up to 1 November 2023, including National Office plug-ins. Further packages can be found on the download software page. Later packages should be installed on top of SP15 full in date order (oldest first). Updates are cumulative per area – only the latest EP, IB or national update should be installed; previous updates are included in the latest package and will only be applied if necessary.