To use our extensions in DW CC, you would need to upgrade to the most recent versions:
These extensions are not compatible with DW CS3 though.
so you would need to continue using the old extensions in CS3. we d not have versions that are compatible with both CS3 and DW CC.
To install the extension in DW CS3, you would need to fix the extension manager issue with Adobe so that you can use the CS3 extension manager.