Hi, I am Dave, I will help you with this.
Are you currently installing Windows form a bootable USB by booting form the USB?
If you are, when you reach the part to set up the network, press Shift + F10 or Shift + Fn + F10 to open Command Prompt.
Run this command and press Enter.
OOBE\BYPASSNRO
The PC will restart.
There should then be a new option at the bottom of that window 'I do not have a network', select that option.
Then setup the user account and do not add Microsoft account details to set up a local account.
That should allow you to complete the instalaltion.