Should be in the settings on your computer, Control Panel for Windows, not sure on others.
It uses a severely outdated framework, IPA, and the people who dislike it tried to get the modder behind it to switch to BepInEx because so many people keep reporting issues that come up, supposedly because of it, even to this day. However, by the time they asked him to switch, months of work had already been put into the mod that would have meant he would have to put all new Kplug additions on hold for several more months.
It was an unreasonable request due to when they asked for it, but it would not have been unreasonable if they had worked with him back when Kplug was still in the early stages.
The outdated framework is why some mods, like the now completely eliminated JannieReplacer, would not work with Kplug for some people.
That's basically all there is to the drama behind it.
It's not that he prefers going solo, he probably would have worked with the modding community, but they all but demanded he switch the entire mod to the BepInEx framework after it had already been in development for long enough to become quite extensive. They made an unreasonable request and fully expected him to comply. When he did not, as anyone with common sense would not, they shut him out. I think the studio only players are more stepping on the bandwagon than actually hating the mod since they don't actually have any experience to hate it on.
How so? Keep in mind I have never played the Danganronpa games, gone through everything else, but have not touched the games yet.