From the installation directory of your old version, copy the following:
1. the file "Plugins\3DxSketchUp.rb"
2. the folder "Plugins\3DxSketchUp"
to the same location in the installation directory of you new version.
For some reason, the Update Wizard does not install the drivers to the new location when you have two versions installed (as most SketchUp users tend to have for a while after a version upgrade).
I know this has been covered in other topics, but it took me a while to figure it out (again...

/fth