Source: http://www.lilith-soft.com/anime/product16/pachi.html
■ How to apply the update file
※ Please be sure to apply with the game finished.
Execute the "PRISON_ACADEMIA 1.0.1" (or PRISON_ACADEMIA 1.0.1.exe) file and start the installer.
The DL version is "PRISON_ACADEMIA_DL 1.0.1" (or...