Alright, as promised, here's the update to get your Kingsaver LEDs up and working.
First you'll need the hex file. You can PM me for the hex file until someone offers to upload it and host it somewhere for download.
1. Download and install
Flip 3.4.7.
2. Hold Esc on your Kingsaver and plug in the USB cable to enter firmware mode.
3. Open Device Manager and locate ATm32U4DFU.
4. Right click and select - driver software update - locate and select ...program files(x86)/atmel/flip 3.4.7/usb folder (or the file path you saved it to).
5. Run Flip 3.4.7.
6. Unplug Kingsaver, hold Esc, and plug it back in.
7. Click the microchip icon in Flip and select ATmega32U4.
8. Click the USB icon next to the microchip icon and select USB and give it the okay to load it.
9. Click File in the top left corner and select load Hex file.
10. Locate truecustomkeymap.hex file and open.
11. Click the Run icon and wait for it to finish.
12. Unplug Kingsaver, then plug it back in and enjoy.