You can also do shift+F10 when a windows install is starting up, then type in `OOBE\BYPASSNRO`. That reboots and allows you to continue without internet and only setting up a local account without needing an online one. Wouldn't be surprised if Microsoft removes this eventually but I do this all the time when setting up new stations for my job.
I read recently somewhere that this has been removed in the latest (alpha?) build now... their intention is clear: this install belongs to Microsoft, not you!
