From Humble Bundle.

Cannot be activated in: AM, AR, AZ, BN, BO, BR, BY, BZ, CL, CO, CR, EC, GE, GT, GY, HK, HN, ID, IN, KG, KH, KZ, LA, LK, MD, MO, MX, MY, NI, PA, PE, PH, PY, RU, SG, SR, SV, TH, TJ, TM, TW, UA, UY, UZ, VN