If you start with a G-code laser and later buy a Ruida-controlled CO2 laser, you do not need to buy a whole new license. LightBurn allows you to pay the price difference to upgrade your G-code key to a DSP key.
Searching for "LightBurn license key best" sometimes leads people to shady forums, keygens, or cracked versions.
Find the to see if a renewal is worth it.
Purchase your key directly from the official LightBurn website or reputable laser manufacturers (like OMTech or xTool). Avoid third-party auction sites offering cheap "lifetime" keys, as these are often pirated and will be blocked by LightBurn updates.