After a bit of a delay, Rhino Games has another code for the free Core set - this time for Harmony! The code comes from WholesomeGMNG.
The code is WholesomeHarmony
This is the second code that got released, after the Norden one. You have until March 15 to redeem the code, so what are you waiting for? To redeem the code, go to the Store tab, and press the Redeem Code button. iOS users will have to use another client as code redemptions are not available on that platform.