To make sure Swift Galleries is allowed to download, do the following-

  1. Go to http://app.swiftgalleries.com
  2. Click Safari from your top Safari menu options
  3. Click Preferences
  4. Click Websites along the top (with the globe)
  5. Click Downloads along the left menu (with the purple down arrow)
  6. On Currently Open Websites you'll see app.swiftgalleries.com
  7. Make sure app.swiftgalleries.com has "allow" from the dropdown menu next to it