Before any upgrade you should backup your SDC config located:
C:\Program Files (x86)\CA\SDMConnector\bin sdc.config
1. The existing SDC connector must be completely uninstalled first- You cannot launch the SDC connector install and upgrade the existing SDC connector.
2. After uninstalling the current version of the SDC connector you then launch the install executable for the version of Spectrum you are installing and then selecting the Install CA Secure Domain Connector option.
3. The SDM which always resides where you have installed the Spectroserver is upgraded as part an upgrade to the Spectroserver itself.