I tried to upgrade 4oD but ran into a script that could not run, so tried removing 4oD and installing again. Unfortunately the installer still thinks it is upgrading and runs into trouble when it can't find a file.

Any ideas on what to delete so the installer does a clean install from scratch??

I had almost teh same issue as you and I used this method outlined in my post here http://community.channel4.com/eve/forums/a/tpc/f/5660030976/m/2290036339