HOW TO INSTAL GRANNY VOICE AUDIO:

1.Open OpenIV
2.Navigate to  x64> audio > sfx > AND COPY " S_FULL_AMB_F.rpf" to "mods" folder.
3.Right click on " S_FULL_AMB_F.rpf" and select "Export To Open formats"
4.Export to desktop
5.Drag all the files from "granny voice audio" folder into folder on your desktop, and replace oryginal files. ( Folder name - a_f_m_eastsa_02_latino_full_01)
6.When you replaced the audio files, drag "a_f_m_eastsa_02_latino_full_01.oac" to OpenIV in the following path - mods > x64 > audio > sfx.

If you have any problem, let me know in the comment