We'll create fresh WordPress site with Add Widget After Content installed. You have 20 minutes to test the plugin after that site we'll be deleted.
The plugin adds a sidebar that you can add any widget content to. The widget is then displayed on single posts or pages after the content, before the comments. You can prevent the after content widget from showing on a post or page from the editor page. You can also prevent the after content widget from displaying on specific posts types, categories, or post formats.