Need some help with your documentation

You need to follow this guide:

https://www.directbasing.com/resources/wordpress/advanced-custom-fields-widget/#custom-widgets-with-acf-widget

Or this one if you use ACF 5+:

https://www.directbasing.com/resources/wordpress/advanced-custom-fields-widget/#create-kick-ass-widgets-with-acf

But please note my plugin is not needed anymore in ACF 5+. Its adopted by ACF itself.

OK, I’ll give it a try. (NOT on ACF 5) so following this link => https://www.directbasing.com/resources/wordpress/advanced-custom-fields-widget/#custom-widgets-with-acf-widget

But at the beginning it says:

If you are a developer and want to make your own widgets, you can extend the ACF_Widget class. This way, your clients can easily manage the widget in the admin and you can freely create the widget HTML output.

so I assumed that was not what I needed :-/ There is no client involved here, all I need to do is create a widget that outputs a custom field group. is that still the right link to follow?

Yep

Ok thanks but still not seeing “widget” in the location drop-down:
WP admin => CF => create new CF => Location does not contain “Widget” – what now? => see screenshot: https://db.tt/ShraD2u5