How to Resolve Error 0x800706ba: RPC Server Unavailable When Installing Office 2021

Follow these measures to rectify the error code 0x800706ba when setting up Office 2021:

1. Reboot your computer: Often, merely rebooting your system can resolve the problem. Restart your machine and attempt the Office 2021 installation once more.
2. Ensure the RPC service is active: Hit the Windows key + R to bring up the Run dialogue. Enter 'services.msc' and hit Enter. Search for the 'Remote Procedure Call (RPC)' service and ensure it's operational. If it's not, right-click it and choose 'Start'.
3. Set the RPC service to automatic: In the same Services window, right-click the 'Remote Procedure Call (RPC)' service and select 'Properties'. On the 'General' tab, confirm that the 'Startup type' is configured to 'Automatic'.
4. Verify Windows Firewall settings: Press the Windows key + R to open the Run dialogue. Type 'firewall.cpl' and press Enter. Choose 'Allow an app or feature through Windows Firewall' and check that both 'Remote Assistance' and 'Remote Desktop' are permitted.
5. Deactivate any third-party antivirus: At times, third-party antivirus software can disrupt the installation. Temporarily disable your antivirus and try installing Office 2021 again.
6. Utilise the Office installation troubleshooter: Microsoft offers a troubleshooting tool designed to automatically rectify common setup errors. Download and execute the Office installation troubleshooter available on the Microsoft site.