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Richard, thanks for the reply
I solved the problem this is a hardcoded bug. The installer tries to remove the certificate with the wrong friendly name:
"AddMachineCertificate: Deleting certificate that begin with friendly name: PharosCACert_wixCert_"
When the correct name is "PharosCACert_wixCert_1". Fix manually delete the certificate with the friendly name "PharosCACert_wixCert_1" from "Trusted Root Certification Authorities" after which the installation will successful finish.
Can you provide some details on how you got to that state, like the previous Pharos Xerox iMFP version installed, OS environment, was it installed using an administrative account?
I could not reproduce this on my test system. I have had previous versions installed and was able to uninstall and re-install Xerox iMFP 2.7.5 4 times in a row without any errors.