Why can't I see my Civilization VI DLC after upgrading to the Platinum or Anthology Editions?

Try the following:

  1. Close Civilization VI
  2. Click the yellow folder icon at the bottom of the screen
    This will open the file explorer
  3. Go to the folder: C:Users[username]DocumentsMy GamesSid Meier's Civilization VI (Epic)
  4. Right-click on the file: Mods.sqlite
  5. Select Delete
  6. Start Civilization VI again
  7. Go to the Additional Content menu