Actually IT-Prof, you are correct, CRS was not completally removed,
although I can't tell you where to look for the pieces that where not
removed, I can tell you how to correct the problem.

The new CRS install is looking at this as an upgrade, there is a script
that is created dynamically executed as part of root.sh (the second
script called by the shell). If you vi that script and search fo the
word upgrade, you will see taht yet another script is called with
-upgrade being passed as a parameter, simply run the script called
minus any parameters and this should bring you to completion of your
installation.

If you require any additional help or have more questions, please feel
free to contact me.

Sebastian