When I launch ChemDraw, I get an error indicating that this is not a valid Win32 application.
ChemDraw 6.0 has been digitally signed. The digital signiture will cause this problem if using KeyServer. The latest version of KeyServer strips out the digital signature. You can also download and unsigned version of the ChemDraw executable file that can replace the original.
|Un-signed ChemDraw Ultra 6.0.2||Un-signed ChemDraw Pro 6.0.2||Un-signed ChemDraw Std6.0.2|
Download the appropriate un-signed file above. Unzip it, and replace the old chemdraw.exe with this un-signed chemdraw.exe.