Insert the "Yaju Senpai Drill" folder in your:
\Steam\steamapps\common\PAYDAY 2\mods

Make sure to first have "SuperBLT" installed.

記得要先安裝SuperBLT，
解壓縮檔案後將 "Yaju Senpai Drill" 資料夾放在你的mods資料夾裡面。