Saves don't matter, not sure why it isn't working. Check for possible remnants of mods that are listed as compatibility issues with Kplug. This is why I always do a manual install, that and I have full control over what Kplug does or does not uninstall.
1. Yes, also, this question has been asked at least a hundred times at this point. There is a search feature at the top right of the page.
2. BepInEx, multiple subfolders inside it have mods. Each mod has its own location, though most go to the same place.
3. No, they are optional for you to install at your own risk. None of them have any special instructions, though LewdCrestX is probably best NOT installed in a build where Kplug, a mod that was removed, but that is still available at
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, is installed as well. It is stuff like that that put these mods in the optional folder they are in. Most are already put into folders that match a game folder, like BepInEx, so just put that folder with the game files where you find the matching folder inside the game files.