How to manually update Windows Defender definition updates? You can install Windows Defender manually in two ways: Manual Installation of Windows Defender updates: In order to keep track of the updates every day you can use any of the following methods: Windows defender definitions updates installation methods We recommend you to check for updates of Windows Defender on a daily basis. What happens? This tool which is supposed to safeguard your systems will not be able to completely protect them if the Windows Defender definition isn't updated regularly. Let's say your entire network is relying on this protection tool and this Windows Defender software isn't updated. It serves as a protection tool by scanning and cleaning your computers.
The Windows Defender is an anti-malware tool which protects your endpoints from data theft, viruses, malware, spyware, etc.