The error occurs on these two lines.
The files need to be rehosted, as the original links don't work anymore. Eddy was considering various options for file rehosting and is not settled yet. GitHub could be used as a temporary solution until a final decision is reached.
The files can be grabbed if you join the N++ Discord and go to this message.
I wanted to put this down as an issue now so new users who use the program aren't confused as to why the error is happening.