### Not able to install the WSSA agent 7.2.1

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#### Products

Web Security Service - WSS

#### Issue/Introduction

When Upgrading the WSSA 6.1.1 agent to WSSA 7.2.1 agent on a windows machine, the following error was displayed on the Windows console:

"A required configuration parameter is missing.  The installer is invalid or is missing the parameter that sets the path to the Unified Agent configuration file located on the Client Manager.  Please contact your network administrator for assistance."

The referenced unified agent was not installed on the machine - it was in the past but had been upgraded to WSSA 6.1.1 without issues.

#### Cause

A prior version of Unified agent still had registry entries that indicated it was on the system

#### Environment

WSSA 6.1.1 installed

#### Resolution

Run regedit and search for "Unified Agent" string

When entry discovered, delete it and hit F3 to make sure no other instances of it exist

When all references to it are removed, reinstall WSSA agent.

With WSSA install issues, always run the installed with the following parameters to gather additional information:

c:\path\to\installer.msi /L*V \path\to\output.log

In our case, we could see the following entry: