WSSA fails to install on Windows PC, after a previous uninstall

Products

• Cloud Secure Web Gateway - Cloud SWG

Issue/Introduction

Having uninstalled an older version of the WSSA from a Windows PC, the install of the newer version just wouldn't happen.

Environment

Cloud SWG

Cause

Possible Cause

The MSI based uninstallation process may have failed to remove product entries on the Registry user hive (HKCU\Installer\Products\<guid>)

Resolution

To properly uninstall the WSS Agent from the Windows PC, please follow the steps below.

1. Uninstall the WSSA 
   
   
2. Delete the entry from the registry, on the computer. See the snippet below, as reference.
   
   
   
   
3. Install WSSA again. See the installer file attached, for your use.

Steps to Install WSSA and Generate Logs via Command Line

Step 1: Open Command Prompt as Administrator

1. Click Start and type cmd

2. Right-click Command Prompt and select "Run as administrator"

Step 2: Run the MSI Installer with Logging

Use this command to start the installation and write a log file to the desktop:

cmd

 

msiexec /i "%USERPROFILE%\Downloads\WinWSSAgentInstaller64-9.8.1.22800.msi" /L*V "%USERPROFILE%\Desktop\wss-install.log"

 

See the snippet below, as reference.

 

 

Explanation:

• msiexec – runs the installer

• /i – specifies "install"

• "%USERPROFILE%\Downloads\WinWSSAgentInstaller64-9.8.1.22800.msi" – path to the installer (adjust if stored elsewhere)

• /L*V – enables verbose logging

• "%USERPROFILE%\Desktop\wss-install.log" – outputs the install log to the user's desktop

Step 3: Locate the Log File

After installation, check the desktop for:

wss-install.log

This file contains a full trace of the install process, including errors and success messages.

Optional: Silent Installation Example

To perform a silent install (no user prompts), use:

cmd

 

msiexec /i "%USERPROFILE%\Downloads\WinWSSAgentInstaller64-9.8.1.22800.msi" /quiet /L*V "%USERPROFILE%\Desktop\wss-install.log"