Error code 0-20390 in Office 2021 typically appears during installation

Error code 0-20390 in Office 2021 typically appears during installation and is often caused by corrupted setup files, remnants of previous Office versions, network instability, or interference from security software. To fix this issue efficiently, follow the steps below:

• Restart your computer and ensure all background Office-related processes are closed using Task Manager.


• Download a fresh copy of the Office 2021 installer from your copyright to avoid corrupted setup files.


• Temporarily disable any third-party antivirus or firewall software to prevent them from blocking the installation.


• Use the Microsoft Support and Recovery Assistant to automatically detect and fix installation problems.


• Perform a clean boot in Windows to minimize background conflicts and ensure a smooth installation environment.


• If previous versions of Office are installed, uninstall them completely before attempting to install Office 2021 again.

For detailed instructions and advanced troubleshooting, visit the official page that explains how to fix Office 2021 error code 0-20390.