Thanks for your posting and using Aspose.Cells.
You can see the Public API Changes to find out what has been changed in the versions released in the past.
Please check the articles find in this section
( http://www.aspose.com/docs/display/cellsjava/Migrating+from+Earlier+Versions+of+Aspose.Cells )
And here are the Public API Changes of v8.1.2 and v8.4.2
( http://www.aspose.com/docs/display/cellsjava/Public+API+Changes+in+Aspose.Cells+8.1.2 )
( http://www.aspose.com/docs/display/cellsjava/Public+API+Changes+in+Aspose.Cells+8.4.2 )
Thanks a lot for that. Very helpful.