I have a 20-user license for BM 3.8 and a media kit on order, but if I
don't want to wait for those, can I DL ISO images and install from those
w/o licenses, just to get the thing running in a test environment with
only one or two users?

How does BM licensing work? If I recall, for Netware, we got some file
or set of numbers that we had to go to a web site and register.

Obviously it's been a long time since I did a BM install and I've never
done 3.8, only 3.6.