Usually light controller users can use the on-line Configurator at https://laneboysrc.github.io/rc-light-controller/ to adjust all settings to their need and use the WebUSB programmer to flash the resulting firmware.
For configuring the light controller offline, please download mk4-download-me.zip.
This archive contains the configuration tool configurator.html. Open this file in your Web browser. configurator.html has the firmware already embedded, just set the options you want and click on the Save firmware image... button.
The configured firmware image light_controller.hex will be stored in the Download folder of your web browser.
If you don't have the WebUSB programmer, you can use the LPC81x-ISP tool included in the archive to flash the firmware. You need a USB-to-serial adapter to connect your PC to the light controller.
Wire-up the USB-to-serial adapter as follows:
In the rare event you want to modify the firmware, please consult README.md for build instructions.