Hi.
@DenisColli:
Yes. You need the latest Steam update AND you need to install the Moguri mod (or Albeoris's Memoria mod), as explained in the "readme" file.
It is very dubtous to have a black screen at launching because of the mod. The "Memoria.log" file may give some insight of the problem, it might be because one of the files in the "Data" subfolder has been somehow corrupted.
@LeOsTyLe:
1) I think that there is a mod for that on Steam. At worst, you may create that mod yourself (it's rather simple now thanks to Memoria):
%u2023 Get the
icon atlas (I obtained it with Hades Workshop's tool "Unity Assets Viewer" from the "sharedassets2.assets", but you don't have to care about it),
%u2023 Replace the icons of the buttons on the bottom-right of the image,
%u2023 Put the atlas file in a folder "PSXButton/embeddedasset/ui/atlas" with the folder "PSXButton" being placed inside FF9's folder. Also, remove the ".png" extension such that the image is named "icon atlas",
%u2023 Add "PSXButton" to the list in Memoria.ini's "[Mod] FolderNames" field.
Hopefully, the PNG compression will not create ugly marks on the icons in-game. If that is the case, try saving it with a looser compression.
2) The mod is fully translated into all the available languages (including japanese). Added dialogs will not appear in english nor crash the game but they will appear in german as long as you play in german.