Bootstrap load theme locally How do I load the Bootstrap theme (css, js, fonts) locally?

I've searched around the drupal stack exchange, but every suggestion I've come across doesn't solve the problem. It seems like the other option is to create a sub-theme, but I'm not even sure if that will load all the necessary files for bootstrap locally/offline. The whole purpose of this is to load the bootstrap theme and its css/js/fonts without using any internet.

The issue is that I'm seeing the error as another user did like this:
https://www.drupal.org/files/issues/screenshot_218.jpg

There are answers like these below, but there has to be a way to do it without more installation other than drupal modules:
https://www.drupal.org/node/1978010
Using own Bootstrap 3 files
You can download bootstrap package and include it in your theme folder.

and go to admin/appearance/settings/bootstrap
then go to 'Advanced' and change CDN provider to custom.
give your local bootstrap css,js urls. 

if you need to import it to a custom theme you can add it the bootstrap package like below. 

your_theme.info

stylesheets[all][] = css/bootstrap.css
scripts[] = js/bootstrap.min.js


define the regions you need in your custom theme info file.

remmber to use the 'https://www.drupal.org/project/jquery_update' module for JS.