Archive containing both .ftl files. SC2Ships: Replace the 18 FTL ships with Starcraft ships. Rename most weapons, drones, augments and crew to Starcraft equivalents. SC2UI: Replace system icons with Starcraft icons. Both parts need Grognak's Mod Manager installed.
You'll need Grognak's Mod Manager installed. Put both .ftl files into your FTL install's mods/ directory, run Grognak's Mod Manager to add SC2Ships and (if you want) SC2UI, then launch FTL.
You may like to use ComaToes's Profile Editor to unlock any ships you've not got so far so that you can try out all the Starcraft ships.