Hi...
Some content packs purchased from the Content Store or Marketplace are classified as derivative content. This means that you must have certain other base products already installed for the pack to work without a watermark.
Please try visiting the product pages for the items you have watermarks with and ensure that you have all the base items listed as being required (if any).
If you unsure about this, please give us a couple of examples of the content with watermarks and we can check for you. A screenshot showing the content will also help. Thanks.