“It worked once, then after a Windows update, it says ‘License invalid’ and the loader crashes.”

Only download installers directly from the official LightBurn Download page.

LightBurnLoader.zip is a compressed archive file that contains a software tool designed to work in conjunction with LightBurn, a popular laser cutting and engraving software. The loader software is used to prepare and transfer designs from LightBurn to a laser cutter or engraver.