You can update your SMH with SIM without using the VCA. Select your servers go to Deploy > Deply Drivers, Firmware and Agents > Install Software and Firmware. If not already configured select your Repository Click on the plus before the Server text, scroll to your OS, select the plus again. Now selct the Software - System Management and again select the plus, now select the HP Version Control Agent for xxx(your OS version). Here select a version higher or equal to 7.3.x . Now click on next,Clear the Reboot systems if necessary atfer successful install just to be sure and select the Install on systems where VCA is not present. Use the specifies administrator credentials below.
Now click Run Now and your servers should get the 7.3.x VCA and should be able to connect to the SMH of the SIm server which is already of version 7.3.x.