help..... what do i download and whats a duplicate?
You can download whichever you like.
The way portraits are done in this game is that you have the regular portrait for a girl. But they also have a non-magical girl portrait (civilian), with 10 different emotions for each. The native game does not (yet) have different portraits for civilian versions so Contemplative Yearning is visually the most complete by having both civilian and magical girl versions of each girl.
After a girl is corrupted at the end of a run during a campaign, she can be recruited as a forsaken, and that's why it's also possible to add forsaken portraits, even if the native game does not (yet) offer different images for it. It's quite nice that the developer
CSdev has created the programming for it to use these different portraits.
Then it's also possible for a girl to be animal or undead, which have their own portraits yet again if I'm not mistaken.
What is meant by duplicates is that the same image is used for the girl in different states (civilian - magical - forsaken - animalform)
---
Please note that the 27 portrait set at the very top does not work with the latest release (45e), but does work with prior versions and is expected to work again with the next release. So if you've got the latest version of the game, it's best to skip that one for now. Otherwise the higher up in the list, the better quality you can expect. If you're unsure what a mod does, I've added a link to the original post offering the mod with the "details" button below the download link for the mod.
Hope this is helpful, let me know if you have other questions.