Well, We made tremendous enhancements regarding existing features and incorporated many new features too. While upgrading from Aspose.Excel to new Aspose.Cells, you need to update your code (in your project) a bit in accordance with latest APIs set/model of Aspose.Cells for .NET. See the document for major/main changes in the APIs set:
Also, in the latest APIs model, all the classes in Aspose.Cells are split into appropriate namespaces for easy access. see the topic here for reference:
(Note: since you might be using very limited set of features e.g loading/saving Excel files, import/export data to data table, etc. so, your main namespace will be Aspose.Cells instead of Aspose.Excel in your existing projects)
We recommend to browse Aspose.Cells Docs with its API Reference to get familiar with the modern product: