1. First, download the newest cumulative update for Windows 10 version you're using. For this case, we use Windows 10 1803 as example.
2. Go to this link https://www.catalog.update.microsoft.com/Search.aspx?q=security+updates+windows+10+version+1803+for+x64 , then search in this first page the latest cumulative update according to its release date.
