Sounds like your still not running the lastest version. When you regsvr32 the DLL, make sure to fully qualify the pathname, like this:

regsvr32 c:\tools\kixforms.dll

or whatever your path is. If you are able to get a form running, left click the app icon in top left corner of the title bar, and click "about..." - make sure the build is 2.3.0.41 ...

-Shawn