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You should use this (because the content saved in the post is unfiltered):

echo apply_filters( 'the_content', $post->post_content );

However, be advised that you should not alter code of plugins or themes that are not created by you. If that plugin is updated, your altered code is probably gone. For themes, you could create a child theme, but for a plugin, you might want to create your own. Creating a simple plugin that creates a widget that displays posts from a category is not too difficult.

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