Please read the documentation file BEEVERYCREATIVE_Bootloader_Updater-v2.0.0.pdf: https://github.com/beeverycreative/BootloaderUpdater/blob/master/BEEVERYCREATIVE_Bootloader_Updater-v2.0.0.pdf
You can download a stable release here: https://github.com/beeverycreative/BootloaderUpdater/tree/master/releases