Rancher 2.x desktop installation

I’m running into errors getting Rancher installed on my laptop. I’m working through How to Run Rancher 2.0 on your Desktop.

Everything down through adding an ingress controller succeeded, but other helm installs fail with the below errors. This includes (1) cert-manager and (2) Rancher itself

Error: validation failed: [unable to recognize "": no matches for kind "Certificate" in version "certmanager.k8s.io/v1alpha1", unable to recognize "": no matches for kind "Issuer" in version "certmanager.k8s.io/v1alpha1"]

Both helm install... commands fail in the same way, referencing certmanager.k8s.io/v1alpha1.

Has the procedure in the above-linked document changed since it was last updated a few months ago (January 2019)?

Thanks for any insight. I am looking forward to being able to experiment with different cluster architectures in isolation.