I found below thread for Aspose.Words and they do not have immediate plan for implementing it.
Aspose.Words on client-side using Silverlight 2?
Does Aspose.Cells have any plans for implementing support for Silverlight? Expecting your update!
We will get back to you soon for your inquiry.
We could not support to make Aspose.Cells work on the client soon.We have to use System.Drawing and GDI+ to implement some feature picture,Row/Column autofit.. etc.
So could you use Aspose.Cells on server and send the data to client.Or please try Aspose.Cells.Grid GUI solution.