Update Windows 7 Offline with AutoPatcher Updater
AutoPatcher is useful to save your time installing a new Windows OS. You can create a custom Windows setup on your own, but AutoPatcher offers an easier way to do it. With AutoPatcher, you don’t have to go through all the troubles of creating a custom Windows setup. AutoPatcher has now been updated to support Windows 7 in addition to the previous supported Windows version such as Windows 2000, XP and Windows Vista.

If you’re still new to this, you can read more about AutoPatcher on the developer’s website. There is a user guide in pdf format that you can download. Basically, what AutoPatcher does is letting you pick which updates you want to download and then save them so that you can use it to update Windows on as many machines as you want without having to do the download again.
Download newest version of AutoPatcher to update Windows 7 offline