I'm also not an expert but these lines seems suspicious for me:
1 verbose cli [ 'C:\\Program Files\\nodejs\\node.exe',
1 verbose cli 'C:\\Program Files\\nodejs\\node_modules\\npm\\bin\\npm-cli.js',
7 verbose argv "C:\\Program Files\\nodejs\\node.exe" "C:\\Program Files\\nodejs\\node_modules\\npm\\bin\\npm-cli.js" "run" "setup"
There should not be double \\, usually it have to be just a single backslash like \
An '\' is used as an escape character. It is used to include special characters (like TAB, new line, etc..) into a string.
To include a backslash (\) you have to put the escape character in front of it. Therefore the '\\'.
Without the escape char the '\n' in the first line would have been understood as 'new line'.
Unfortunately i don't know what caused OP's problem. But i'm pretty sure it is not because of the double backslash.
OP, do you have the 'pack-age-electron' script in the right directory?