The base game assets for Ready or Not are the intellectual property of VOID Interactive, and users are generally not allowed to use these assets in mods or files that are being sold, monetized, or earning donation points without explicit permission
If you use these assets in your game you are stealing their intellectual property. I know these assets look amazing and can be tempting to use however this applies to most games that allow mods like Skyrim, fallout 4 , counter strike ect.