So apparently changing my system locale to Japan solved all of my issues and no complicated steps were necessary at all.
Not a coding expert but I suspect the unicode couldn't read some of the characters, which I'm guessing were the Japanese letters in the files but that doesn't make sense since there are others who managed to run it just fine. But it got the job done so all's good.
The command prompt will look funny and display unknown characters when running "3_write_config.cmd" but it got me the latest characters.
If anyone has the same problem on dmm, try changing your system locale to Japan before running the scripts and it should work fine.