I couldn't find much in the docs, so I searched the forums. Here's what I came up with:
1) Goto http://anywhere.impulsedriven.com/home.aspx, login, click on demigod
2) Click on the 'If you have Impulse but would like to download a full offline installation, click here to download Demigod." link
3) Download the nine file (a few gigs worth)
4) Have the other LAN participants run the demigod installer from step 3
Is that the best/appropriate way?
Also, I either have to avoid patching my licensed copy or I'll have to download the 3 gigs all over again - is that right or is there an easier way? Is it possible for the LAN participants to get a small patch instead of downloading/installing 3GB every time?