You can try copying .torrent files of the update on a USB stick or something, get somewhere with a nice internet connection, download torrents, get back home, copy the update on the right sub-folder in your DCS install, start the updater again, it should detect the files :thumbup:
Edit: You can find .torrent files in "DCS World\_downloads\.torrents", but you have to start to download the update to get them. It's also in this folder that you'll have to paste downloaded files.