I have coreos: 1.5.4 instaled via homebrew on a macbook using mac 10.13.2 (17C205).
When I run CoreOS App, a Terminal open but stops here:
[WARN] /Users/fabs/.coreos/images/stable/1576.5.0/coreos_production_pxe.vmlinuz missing - stable/1576.5.0 ignored
---> downloading and verifying stable/1576.5.0
[ERROR] Signature check for DIGESTS failed.