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Ripperger has been refuted from primary sources.  There have been many long threads on this subjet, but one of his apologists / water-carriers finally cited the passages from St. Alphonsus, and so I looked them up, cited them (go look for it), and the sleight of hand was accomplished by Ripperger conflating two separate things, where you can't make requests of the devil and then speaking about how only exorcists can perform solemn exorcisms.  So Ripperger blended the two and claimed that lay people can issue commands to the devil, just so long as it's not a solemn exorcism.  But that's false, and I cited St. Alphonsus in the very same passage where he states that only those who have authority over the commandees, aka, the demon, can issue commands, i.e. exorcists.  But that part was skipped.

Which book?

Art. 6. Adjuration

1. Definition. Adjuration is the use one makes of the reverence, fear, or love which another has for the name of God or a holy thing to induce him to do or omit something.

In adjuration, therefore, one person tries to obtain something from another in virtue of the latter’s reverence or fear of God. All who know God may be adjured — that is to say, God Himself, Christ, our Lady, the saints, men on earth, the devils.

Adjuration is solemn if made with the ceremonies prescribed by the Church; otherwise, it is simple. It is precatory if made in the form of a request; it is comminatory (imperative) if accompanied by commands.

Principle. Adjuration which fulfills the requisite conditions is an act of religion and therefore lawful and morally good.

By such an act recognition is made of God’s majesty. Furthermore, it is an act which has often been used by the Church.

The requisite conditions for lawful adjuration are the same as those for a lawful oath; namely truth, justice, right judgment.

Truth demands that the agent should not deceive the individual who is adjured.

Justice demands that he intend something that is lawful.

Right judgment demands that adjuration should be accompanied by due reverence.

1. Exorcism. In its strict sense, exorcism is the expulsion of the devil from one possessed; in its wide sense, it includes the nullifying of the devil’s influence in any creature. In a solemn exorcism, understood in its strict sense, the directions of the Church must be scrupulously observed. It is of prime importance to obtain the ordinary’s permission since it is his function to decide whether it is a genuine case of diabolical possession and whether it is fitting to perform the exorcism solemnly. [See [1917] CCL, Can. 1151ff.] Private exorcism may be performed by anyone, but its influence is greater if exercised by one who has received the Order of exorcist.