Meanwhile I got the impression that this problem occurs when the components in question have been registered elsewhere after installation - as it happens on developing systems or if the service guys tampered with the installation to have a second ver...
I have the same problem. The component contains one DLL and three exe-files. I get no complaint about the executables, just unregistering the DLL fails. This has been working in IS10.5, though.It certainly looks as if IS has deleted the DLL before un...