A requirement has arisen where I need to use 8.1 Pro. However I do not want that particular PC to see the internet ever. At the same time I want my 8.1 install to be fully up to date preferably without using any third party update tool/program/script. So I'm wondering whether installing the latest October SSU, Security Monthly Quality Update would be enough to fully update my 8.1 install? Or is there anything else I must also need to download from the Microsoft Update Catalogue site?
Just use: + https://forums.mydigitallife.net/threads/whdownloader-download.66243/ The script simply uses DISM (the only way to integrate updates) in a smart way, to properly update the ISO.