Failed to read save file in standalone .exe

Project gets packaged, gets run as a standalone (without editor).
Death mechanics stopped to work because the high score loader is not working (I am using Epics tutorial on SaveGame, I also init SaveGame setting a high score value of 0 if it fails to read (= file doesnt exist)).

Here is the log file. https://gist.github.com/Zarkopafilis/9678478e4fb5feccc641