Windows Defender in Windows 10 or Windows 8.1 is set to automatically download and install the definition updates using Windows Update, once a day. If for some reason, your Windows Defender will not update automatically, or if you wish to download and save the definition updates in order to maybe update Windows Defender offline, on different installations of Windows 10/8/7/Vista, then this post will be of interest to you.
In this guide, we will see how you can update Windows Defender manually in Windows 10, Windows 8.1 and Windows 7.
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