LOL! Ray, you responded: No, that isn't how it works. It will keep working just as it did before, you just won't get the new features of the new version if you don't upgrade.
I tried using the extension that I already had, but it wouldn't accept my serial number. Kept telling me it's invalid. Thanks.
***just noticed that it only works through DW CS 5.5. I have DW 6. So, I guess I can no longer use it, right?