- Restart your PC and close any Office‑related tasks in Task Manager to clear stuck processes.
- Download a fresh Office 2021 installer from your copyright to ensure you have a clean setup package.
- Temporarily disable antivirus or firewall software, which might be blocking the installation process.
- Run the installer as administrator by right-clicking and choosing “Run as administrator” to bypass permission obstacles.
- Use the Microsoft Support and Recovery Assistant to automatically detect and resolve installation errors.
- Perform a clean boot to isolate and eliminate potential conflicts from other applications or services.
- Repair Office via Control Panel: go to Programs & Features → Microsoft Office → Change → Repair to replace any damaged components.
- Verify essential services—including Windows Installer and Background Intelligent Transfer Service (BITS)—are up and running via the Services console.
For a detailed walkthrough, troubleshooting visuals, and advanced solutions, refer to the official guide on fixing Office 2021 error code 0‑2054.