火炬之光2That product key is not valid or has already been registered解决办法

有玩家在玩火炬之光2的时候输入key却说That product key is not valid or has already been registered，这怎么办呢，其实这是你没有操作好导致的，下面跑跑车就告诉你怎么解决这个问题。