Page Builder 
Widgets Bundle 
SiteOrigin CSS 
Installer 
Incorrect filter name on extending existing widgets tutorial
Below the section titled “Changing the template file” the filter hook is named “siteorigin_widget_template_file_sow-button”, it should be “siteorigin_widgets_template_file_sow-button”. URL: https://siteorigin.com/docs/widgets-bundle/getting-started/extending-existing-widgets/