According to Humble Bundle, this key is not available in the following countries: BO, HN, BR, BS, KG, BY, BZ, CN, NI, PY, PA, TJ, RU, PE, TM, GT, CO, VE, CL, AM, EC, GF, GE, AR, GY, CR, AZ, MD, UY, UZ, SR, SV, KZ, UA

Good luck!