Unable to install SSL VPN Client v5 on Windows due to previous v3 installation

Applicable products

SSL VPN v5.x

Description

Symptoms : 

When attempting to install SSL VPN Client v5 on a Windows system, the following error message is displayed: "A previous installation of SSL VPN Client v3 has been detected. Please uninstall it and run the installation program again." However, the SSL VPN Client v3 is not present in the list of installed programs or cannot be uninstalled.

Explanation :

Files or registry keys of a VPN SSL v3.x client persist despite uninstallation. These files or registry keys are detected by the SSL VPN v5.x client installation program.

Solution

To resolve this issue, follow these steps:

  1. Download the clean_old_sslvpn_version.ps1 PowerShell script from here.
  2. Open a PowerShell prompt as an administrator.
  3. Navigate to the directory where the script was downloaded.
  4. Run the following command: .\clean_old_sslvpn_version.ps1

This script will remove any remaining files and registry entries from the previous SSL VPN Client v3 installation, allowing you to successfully install SSL VPN Client v5.

Note: Make sure to run the PowerShell prompt as an administrator to ensure the script has the necessary permissions to make changes to the system.

By following these steps, you should be able to resolve the issue and install SSL VPN Client v5 on your Windows system.