Check here: http://gimpchat.com/viewtopic.php?f=9&t=18685&p=254719
I did it and got it to work, but not version 3, just 1 & 2, which I found not very useful. Good luck
Iām curious about this as well. What are the lightburn features that do the same thing? New to this and would love to save the $30. lol
Apparently he will take your money for the plugin, but he just wonāt give it to you. Iāve been waiting for a link or something after payment for 2 days, and iāve sent 3 emailsā¦one email directly, one through his website, and one through pay palā¦and got no response from any of them. I would LOVE to comment on how well it works, butā¦ If anybody has contact with him, please let me know.
If you go to āMy accountā on the infinite laser website there should be the link for download. I was in the same boat when I bought it but he doesnāt explain that well on the product page
Well, I didnāt set up an account on his websiteā¦I just purchased it as a āguestā. 
And none of his links for social media work eitherā¦sounds like I got screwed.
If you paid with PayPal, you can open a dispute there because you didnāt get the merchandise, and credit card companies will let you submit a chargeback for the same reason.
Yeah, Iāve already started that processā¦I would rather have the plug-in though.
You truly donāt need it - LightBurn will do the same things internally, with slightly more effort (though Iām planning at some point to have an āAutoā button that sets the image options based on some info about your machine).
Select the image, right-click, āShow Propertiesā, and bump the contrast up by 5, and the brightness down by 5. Set Gamma to 0.8, Enhance Radius to 5, Enhance Amount to 200, make sure your DPI on the image layer isnāt too high (the default 254 is a good starting point) and set Stucki dithering. Give that a try as a starting point.
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Many Thanks! I thought the DPI would need to be much higher than that. We always did photographs on paper at at least 300 dpi.
One of the many misconceptions about lasers, unfortunately, is that they are printers. They are not. 
The laser produces a dot that has a minimum size, and if you set the DPI higher than that, it just all starts to smear together.
See here:
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Thanks for the great information!! As a LONG time photographer, I am looking forward to seeing how some of my images come out as engravings.
Have an additional question as I have tried a few photos white tile method. I use a Atomstack and supposedly higher output no focus. My white tile looks flat, smudged not good detail.
Thanks