Extract from the archive folder of modification and copy them to a folder with the game
Starting
run the game with debug mode enabled;
choose any save that can be ruined (it is better to start a new game and get to the point where you have control of Harry);
go To the menu by pressing Esc;
press F4;
in the list to find the file Grounds_hub_Winter.unr / Grounds_Night_Winter.unr / Grounds_Night_Winter2.unr and to apply to it, double-click the primary mouse button (default — left).
Video Walkthrough (can be used cheats)
Note: after downloading the modification from any site, be sure to scan it with antivirus software.