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 device
Now, locate “Windows Defender Firewall”
Navigate to the left pane
And tap on “Turn Windows Defender Firewall off”
2. Repair and Reinstall
Repairing 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” section
Locate Office installation and right-click on it
Then, tap on the “Change” option
Select “Online Repair” and wait for it to end
Restart your device and reinstall Office via office.com/setup
3. Disable proxy servers
If 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.