Installation and usage:
- Disable anti-cheat
- Open Mod Engine 3 Manager
- Chose "Nightreign" on the left bar
- Drag and drop the regulation.bin file onto the are in the middle of the window, which says "Drag & Drop mods here..."
- Press the blue "Lauch Nightreign" button
- Go to locker and buy all skins
- Now you can launch Nightreign in online mode through Steam as usual and you (probably) won't get banned
To transfer the skins to Seamless co-op just rename all save save files in "AppData\Roaming\Nightreign\*your steam id*" from .sl2 to .co2
Additional thanks to this mod for inspiring me: https://www.nexusmods.com/eldenringnightreign/mods/68