FYI: the Schema Wizard tool is now a separate install from core ArcGIS. You can access it from your media disc or download from the Esri Customer Care site. Please see this blog post from the Geodatabase development team on the status of CASE tool support in ArcGIS:
I can not download Schema wizard even Esri Customer Care site.
Did you contact someone at the Esri Customer Care site for assistance? Did you email them and provide your customer info? Please do as I am sure someone will follow up.
After installing CASE Tools I get the following error whenever I open ArcCatalog:
DDE Server Windows: ArcCatalog.exe - No Disk There is no disk in the drive.
It doesn't actually affect anything and I can cancel the error but it's very annoying. I have uninstalled CASE tools and the error persists. I will try and reinstall SP4 and see if it helps