Should the money be returned to the person who paid a portion of the partnership amount in a different currency and then refused to complete it, in Egyptian Pounds according to the agreement, or in the currency he paid?

The withdrawing partner, before the partnership commences, is to be repaid his capital in the currency to which it was converted, which is the pound, because it was converted with his permission. An agent is not liable unless there is transgression or negligence. It is a condition for the validity of a partnership that the capital be present.