Hm, hm, now it works. Does the folder name have to be identical to either "name": "ModernGUI", "label": "ModernGUI", in "mod.json"?

try renaming to  .local/share/0ad/mods/ModernGUI

To make it more consistent among Civs, all Cavalry that can hunt have a special melee attack against defenseless animals   German civilians have a damage multiplier against animals (including hostile ones) or Civilians have a damage multiplier against defenseless animals    

"Jagsus" 

This mod does not appear in the in-game mod menu. https://wildfiregames.com/forum/topic/140750-civilians-with-female-voices/ appears in the mod menu. I have installed / copied it to  /home/tre/.local/share/0ad/mods/ModernGUI-master  mod.json is directly in the folder. What did I wrong? This gives this error: error code 404 error_ref 14000 message "The requested resource could not be found."