I was part of a project to upgrade Enterprise Vault system - my task was to ensure the Enterprise Vault Outlook plugin is properly deployed to Outlook clients. However, during my testing to install Enterprise Vault Outlook Plugin ver 12, I faced an issue as below : Location is not valid. Choose a different installation location.  No logs, just a warning.  Thererfore, I performed some troubleshoting, which leads to the resoluton. Issue :  Unable to install Enterprise Vault Outlook Plugin version 12 - error : Location is not valid. Choose a different installation location.  Troubleshooting  Normal EV Outlook plugin installation won’t produce any log. Therefore, for troubleshooting purpose (which then be used during automation), the installer executed with MSIEXEC command : msiexec /i "C:\temp\EVOutlookClient\Veritas Enterprise Vault Outlook Add-in (x86).msi" /qn /norestart /l* C:\temp\EV12Installation.log   Based on the log, these error (marked in ye