Welcome here to the Forum.
Catholic doctrine is not generally relevant to most visitors to the Forum, who are Evangelical, like BioLogos. (Not everyone here is Evangelical, or even Christian, as you've seen. Most of us just stumbled upon this place and stayed for the intelligent conversation.)
That said, my understanding is that there is a particular scenario that would be acceptable to Catholic doctrine and does little violence to the mountains of scientific data that support evolution: That is, a scenario wherein God guided evolution up to the point that there was a small group of, say, 10,000 hominids who were 99.9% human; He then specially created Adam and Eve and breathed souls into them such that they were 100% human; they sinned and fell, and then Adam and Eve had children who interbred with the 99.9% humans (who were similar to Adam and Eve save for not having a soul, the image of God, and the stain of original sin). Within just a few generations, Adam's 100% human genes (along with original sin / a soul / etc.) would have passed on to the whole community of 99.9% humans so now they're all 100% human, and then this population expanded to fill the earth as we now know it, as homo sapiens.
This scenario isn't without its drawbacks, but it seems to fit what you've described of Humani Generis (supplemented by a bit of info that I just looked up on the interwebs) and I think it accommodates a good amount of the scientific evidence as well. But if you're Catholic, you may know better than I....