I disagree with Yeti. (Sorry, guy! ⛄️) Nothing personal intended.  I’d prefer he were conditionally re-ordained, but don’t believe a lay person can judge in the internal forum in such matters.  His sermons, conferences, and books are largely quite good.  He is obviously well-educated in the Faith.  The one matter on which I agree in part is that some of his material do border on superstition, or can lead one to think in such a way.  Let’s say that someone who is already superstitious, overly timid, paranoid, or too scrupulous could get themselves in spiritual confusion if they don’t have a good spiritual director to guide them. 
On the basics of spiritual warfare, Fr. Ripperger is an excellent resource, IMO.

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Fr. Ripperger is an invalidly ordained Novus Ordo priest who promotes superstition and whose sermons sound like a chapter in a Harry Potter novel.

I do not think Fr. Ripperger teaches that lay people may directly command demons.  I agree, that is thoroughly Protestant and specifically Pentecostal.  It’s dangerous.  I had a roommate who went to a Pentecostal church and she died just before her 35th birthday because her “deliverance” group that included her fiancé had her believing that the “demon of diabetes” had been cast out.  All she had to do was have the faith to “claim” her healing.  She did this by throwing out her insulin and supplies.  She ruptured an aneurysm in her brain and died in her sleep. 
Lay people shouldn’t even dabble in exorcism or “deliverance” except under the direct guidance of a qualified priest.

Though I haven't seen Fr. Ripperger's prayer book, his book Dominion has a whole chapter about authority. Basically, he says that among laity, authority is within the family: father over wife and minor children, and I think he explains a qualified authority of the wife toward the husband in the sacramental reciprocity of marriage (not to get too far into detail there). A mother's authority over her minor children in effect is delegated to her in a limited sense by her husband. Grandparents have no authority over grandchildren unless delegated by their father, and adult children have no authority over their own parents. The 1962 Missal also includes several deliverance prayers for private use by laity. It would seem that within the family is when these would be allowable, yes? 

Beyond the above, Fr. Ripperger says that no layperson should ever attempt to engage with demons afflicting any other person. Yet it's essential that one have self-authority with regard to demons, otherwise an exorcist would be blocked by the affected person's non-cooperation.

The group that calls itself "Catholic" but is dangerously Prot-friendly is Neil Lozano's "Unbound" or "Heart of the Father" -- definitely stay away from them. They don't even acknowledge Our Lady nor any of the Saints.