How to Fix Microsoft Office Error Code 0‑20390

How to Fix Microsoft Office Error Code 0‑20390

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Microsoft Office Error Code 0‑20390 usually occurs during the installation or update of Office 2021 or Microsoft 365 when the process is interrupted by network restrictions, firewall blocks, or incomplete setup files.

To resolve this error, start by temporarily disabling your antivirus and firewall to ensure they’re not blocking the installer. If you’re on a corporate or VPN network, disconnect from it and use a trusted, unrestricted connection.

Next, uninstall any existing Office installations through the Control Panel or Settings. After removing Office, delete leftover folders from C:Program Files and C:Program Files (x86), and clear temporary files in the %temp% directory to remove any corrupt install data.

Once your system is clear, download a fresh Office installer from your copyright and choose the offline installer version if available. Install Office with administrator privileges to avoid permission issues.

If the error persists after these steps, follow the complete troubleshooting guide available at WinChatSupport for Error 0‑20390, which includes additional solutions to resolve the issue.

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