After the upgrade to Kodi 20.1, this broke:
error <general>: Repository add-on repository.kodi_libretro_buildbot_game_addons uses old schema definition for the repository extension point! This is no longer supported, please update your addon to use <dir> definitions.
error <general>: Repository add-on repository.kodi_libretro_buildbot_game_addons does not have any directory and won't be able to update/serve addons! Please fix the addon.xml definition
Looks like the first was fixed by this: Update repos for new schema by garbear · Pull Request #11 · zach-morris/kodi_libretro_buildbot_game_addons · GitHub
What’s the recommended way for Snes9x on OSMC Kodi 20?