Find the folder on your computer where the original game is installed (e.g., C:\Games\NagisaProject ).
Because these patches modify .exe or .dll files, some antivirus software may flag them as a "False Positive." Only proceed if you trust the source where you downloaded the file.
Download and install 7-Zip or WinRAR. Right-click Nagisa_Eng.7z and select "Extract to [Folder Name]" .