From the announcement:
By popular request, Night of Man: Alone Against the Aliens is now available as a PDF through our download partner, Wargame Vault. In the Night of Man solitaire expansion, Alone Against the Aliens, you can play alone against the Killers. The expansion includes a separate deck of cards that controls the aliens as you lead the Earth Militia is six thrilling scenarios. Includes a rules and scenario book, solitaire counters, and a 27-card AI deck.