You'll need to remove the RPM before attempting to run the installer. You can terminate any of the vCD processes using kill -9 <pid>. Just identify any running vCD processes (e.g. ps auxw | grep vcd) and then kill them. Once the processes aren't running it should be possible to erase the RPM. If it continues to fail to uninstall once you've killed the processes you can add the --noscripts flag to have rpm skip the failing part of the uninstall process (see the link above for more details about what it means).
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