The only way to get a "high quality" (stable and secure) version of LightBurn is through their official channels. LightBurnSoftware.com Current Version: 1.7.03 (as of early 2024).
Go to the official LightBurn Software website. Do not use third-party "developer" sites. lightburn 1201 download high quality
It is the final version officially recommended for Ubuntu 18.04 users who cannot upgrade to newer Linux distributions. The only way to get a "high quality"