A 'player' version is definatelly cool to light up unity \ xps maps without 'baked' ones - since these 'free fake lights' does NOT affect atom persons.
But most of the resource overview page is showing what the 'full version' can do. Ofc, there is a big text saying that's 'free ver' is limited. Okay. But full version advantages took more than half of description.
Also plugin is with DRM which is a another no-no from me. I could consider one time buiyng and keep it forever [without updates], so wouldn't need to pay it again in case i would change something in my PC, but 'individual keys', meh