when was it designed?
Plantinga's adapted Augustinian theodicy, the free will defence – which he proposed in the 1980s – attempts to answer only the logical problem of evil.
Augustinian theodicy
Plantinga's adapted Augustinian theodicy, the free will defence – which he proposed in the 1980s – attempts to answer only the logical problem of evil. 
what is the  augustinian theodicy? The Augustinian theodicy, named for the 4th- and 5th-century theologian and philosopher Augustine of Hippo, is a type of Christian theodicy designed in response to the evidential problem of evil.
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Augustinian theodicy [SEP] Introduction
Hick regards evil as necessary for the moral and spiritual development of humans, and process theologians have argued that God is not omnipotent and so cannot be responsible for any evil. The logic of Augustine's approach has been adapted by Alvin Plantinga, among others. Plantinga's adapted Augustinian theodicy, the free will defence – which he proposed in the 1980s – attempts to answer only the logical problem of evil. Such a defence (not a "theodicy" proper) does not demonstrate the existence of God, or the probable existence of God, but attempts to prove that the existence of God and the presence of evil (or "privatio boni") in the world are not logically contradictory.