In reply to Parson Brown.

That’s not the case, when an Elementor license expires they’ve made a change so that “pro” widgets you previously bought or added are no longer draggable, or addable .
So if for instance a client accidentally removed their testimonial block, and saved the page, they could not then re-add it. This change was made in Elementor 2.9

The significance being : The license for a previous version, once it expires, locks the user out of the functionality.

SOURCE:
https://elementor.com/help/why-cant-i-drag-the-pro-widgets/