Is it permissible to seek the help of a Muslim spiritual person to complete the paperwork for renewing a workshop license owned by the fiancé, who is facing threats of imprisonment due to accumulated debts resulting from the delay in renewal?

It is not clear what is meant by "a spiritual person who inherited it from his father." However, if it means seeking assistance from jinn to renew a license, then this is forbidden by Islamic law, even if it were possible and for a permissible benefit. But if it means seeking assistance from a human being, then the default is that it is permissible to do so in obtaining worldly benefits, even if the person from whom assistance is sought is a disbeliever.