When upgrading to a newer version of OfficeWriter, it is recommended that you Remove the existing version of OfficeWriter and then follow the instructions to Install OfficeWriter for .NET or SSRS.
The OfficeWriter installer does not update the DLLs in your applications' bin directories or your machine's GAC. When upgrading, make sure to upgrade the references in your application to point to the new DLLs.
When upgrading from OfficeWriter, some changes to your .NET code may be required.
For details see: