Since version 3.5, 30th Jan 2006 Aspose.Word has been renamed to Aspose.Words.
1. The product was renamed.
2. Aspose.Word.dll was renamed to Aspose.Words.dll
2. The Aspose.Word namespace was renamed to Aspose.Words.
If you are upgrading, you need to remove the reference to Aspose.Word.dll and add a reference to Aspose.Words.dll and change all your "using" or "imports" namespace Aspose.Word to Aspose.Words.