How to install patch for Anime Lilith 監獄アカデミア???

Firstly, you need to know if you have the physical or the download version the game. The patch for the physical edition is here and for the download version here. Since you said "downloaded", it's best to try the second one.

Then download the file, save and extract it.

Then you have two methods to apply the patch: The first one is to run the .exe file in the archive and follow the instructions (they are in Japanese), or the second one (the easier one) would be to copy the file "root.pfs.011" into the folder "Input" (which is located in the folder where you installed the game to).

This were the last two points on the page. The other points are the changes.

Just make sure you have a backup of your save file (located in C: \ Users \ [User name while logging in to Windows] \ AppData \ Roaming \ ANIME LILITH \ Prison Accademia).

If I'm translating the whole thing right, there could be a problem with one scene in the gallery if you're already past a certain point of the game, but since I never played the game, I can't tell you which scenes this are.