I've a Windows 8.1 PC which hasn't been updated for more than 6-7 months, few days back I've downloaded latest Windows 8.1 ISO(with Update 3 or whatever it is called). Now instead of updating the current system online, I would like to use the downloaded ISO(or burned dvd containing it) to apply updates. Is that even possible with(in) Windows?. Note: I don't want to use Windows Setup & go through a upgrade (installation) process. I just want to apply updates just like it is done using windows update(online) but using latest ISO(dvd), presuming it is possible.