Windows doesn't have the "go-ahead" to write files to the destination folder.

and you have a rotary attachment, some users use "Rotary Mode" to treat the roll like a cylinder. In version 1.6, you can also use Galvo Rotary

The simplest solution often works.

LightBurn offers responsive support through their official forum and email. Provide them with the installation log you generated in Option B. They have been known to release hotfixes for installer bugs.

Error 1603 often occurs when remnants of an old LightBurn installation block the new one.

LightBurn relies on Microsoft Visual C++ runtimes. Missing or corrupt runtimes can cause a 1603 error.