default (Mac OS X): /Applications/NewTek/LightWave3D11.6/support/plugins/scripts/Python/Layout/Master
You can find the plugin in Layout's Utilities tab: Plugins → Master Plugins → Add Layout or Scene Master → Sketchfab.
How to use
Open the Sketchfab uploader from your Master Plugins.
Enter a title, description, tags and your API token, and mark it as
Private if necessary.
Toggle Rotate Vertical Axis as required. Typically, you will want to turn this OFF.
Click Upload to Sketchfab!
If your model contains SubPatches, you will get a warning asking you to freeze your meshes before uploading. Similarly, if your model contains nGons, you will get a warning asking you to triangulate your model before uploading. You can upload it anyway, but you might get undesired results. When the upload is complete, you can view your model on Sketchfab, adjust rendering settings, and save the default view.
For more detailed instructions and other information, including specifics on SubPatches, texture mapping, nGon triangulation, and troubleshooting, visit the blog or watch the video above.