1. Disable/turn off the Windows Firewall If you have an active firewall on your device, then it may restrict the downloading process of certain programs. Thus, you may try to disable this firewall using the process given below:Open the Control Panel on your deviceNow, locate “Windows Defender Firewall”Navigate to the left paneAnd tap on “Turn Windows Defender Firewall off” 2. Repair and ReinstallRepairing the Office files would help you to fix this error. Perform the following steps to do so:From the Control Panel, go to the “Programs and Features” sectionLocate Office installation and right-click on itThen, tap on the “Change” optionSelect “Online Repair” and wait for it to endRestart your device and reinstall Office via office.com/setup3. Disable proxy serversIf these two methods failed to help you, then you should disable the proxy server settings on your device by navigating to the “Network Internet” Settings menu.