If you try ./citadel-/nnnnnnnnnn-xxx/.appimage --help
As an unrecognize option, it will show you the supported parameters and command: run, test, install, database_cleanup
To install you need: ./citadel-/nnnnnnnnnn-xxx/.appimage install
If you try ./citadel-/nnnnnnnnnn-xxx/.appimage --help
As an unrecognize option, it will show you the supported parameters and command: run, test, install, database_cleanup
To install you need: ./citadel-/nnnnnnnnnn-xxx/.appimage install