For Windows, download the fix that you need. Right-click it and choose "Extract All."
Type "C:\Program Files\Kansei\game\" into the bar like in the image above and click "Extract." It will ask if you want to overwrite a file. Say yes. Now you're good to go!
For Macs and Linux, extract the files from the .ZIP folder and place them in the "game" folder wherever you've installed Kansei.