I understand you are unable to purchase THX Spatial Audio because your billing address isn't recognized. I’m sorry to inform you that the THX Spatial Audio Support is currently available in all countries. However, you can still obtain the Razer THX program by placing an order with a friend who lives in one of the countries where THX Spatial Audio is available and asking them to provide you with the activation code. You can purchase THX Spatial Audio on Razer.com if you are located in any of the countries listed below:
Australia, Austria, Belgium, Bulgaria, Canada, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hong Kong, Hungary, Ireland, Italy, Japan, Latvia, Luxembourg, Malaysia, Malta, Netherlands, New Zealand, Norway, Philippines, Poland, Portugal, Romania, Singapore, Slovakia, Slovenia, South Korea, Spain, Sweden, Taiwan, Thailand, United Kingdom, United States.
f you need further assistance, please feel free to PM me. Have a great day!