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ISSUE
Users attempting to install or update the Webex meeting software may encounter an error message stating: "Setup was unsuccessful. Please try again. Error [104]." This error prevents the successful installation or update of the Webex software on their computer.

RESOLUTION
To resolve the "Setup was unsuccessful. Please try again. Error [104]" error, follow these steps:

1. Uninstall the Webex meeting software from your computer, see: WBX19806 - How Do I Uninstall Webex Software on Microsoft Windows?
2. Download, extract, and run the Meeting Services Removal Tool.
3. Install the Webex meeting software using the manual installer.
   • See: WBX21270 - How Do I Download the Webex Client?
4. Exit and restart any open web browsers, then try to join the session again.
   

CAUSE
Error [104] typically indicates an issue with the installation process of the Webex meeting software. This could be due to corrupt installation files, conflicts with previous software versions, or insufficient permissions to install new software on the computer.