I save all my updates to CD to avoid the problems that you are concerned with. When you know the update number, usually begins with KB followed by a number,
Go into the Windows Update site, ( via Help & Support, Windows update ) click on Administrator Options. Then select Windows Update Catalogue. Click on Find updates for Microsoft Windows operating systems. You will see a pick list so scroll down and select your version of Windows. Then click the Search button. All available updates will be shown. Click on this and you will see all avalable. Save as many as you want to the download basket and when finished, download to a destination of your choice. Hope you can follow this OK. It is really very easy ! Good luck.