Doesn't seem to work for me. This is what I get when I try it.
SCRIPT ERROR: _init: Invalid get index 'portraitCache' (on base: 'Node (globals.gd)').
At: user://mods/conquestrandportraits/randomportraits.gd:7
What was the method you used to install? That error usually indicates you didn't drag and drop the src and the gui_modules folder over to the strive install location.