I finished trading futures and

I finished trading futures and couldn't withdraw money after making a profit. It is required to pay 30% tax after deducting the tax exemption before withdrawing money. The platform that the master asked me to download at the beginning said that he had been using it when he was in London, and the version I had was different from his. https://www.gateio-coin.com/download This is the platform address they gave me. Currently the principal cannot be withdrawn, please help me.