Hello @Terrylawdinn,
The update you downloaded is for City Update 7. The City Update itself is an optional free download from the Marketplace, but as with all World Updates and City Updates, you will receive a small mandatory update when first launching the sim that includes things like new menus, etc. You can find more information in News & Announcements here:
Thanks,
MSFS Team
Edit: I just saw my colleague @Chewwy94 already answered this question above.