Hi Stan,
The bug with loading the file is fixed, so now you don't need the local generator script in order to work. You can continue using our online script because that script is continually updated and improved.
Actually, now you can load a file located in some other folder with a little workaround.
If you notice in the browser address bar, at the end you can see the parameter ?data=my-custom-data.txt
so you can change that to: ?data=file:///path/to/file/my-custom-data.txt
where /path/to/file/ is the full path to you custom data file. Don't forget the file:// prefix because some browsers can't load the file without it.
Anyway, you don't have to enter the path like this if you open the data files from the template root folder as I mentioned previously.
All the best,
Dimitar