Steve Jackson’s e23 digital store now has copies of the PDF versions of the rules and ship cards from the Klingon Armada game.
From their website:
These are the PDFs for the rules and scenarios from the Klingon Armada product. (Klingon Armada is an expansion to the Starmada game system, done as a joint venture between Amarillo Design Bureau, Inc., and Majestic Twelve Games.) Included are the basic Starmada “quick start” rules, along with specific rules for the Federation, Klingons, Kzintis, Orion Pirates, and Tholians (phasers, photon torpedoes, drones, disruptors). You will need the Klingon Armada Ship Cards to use these rules.