Cert-manager ACME client is too old

Hi community

i have installed the cert-manager from the app catalog (library). Unfortunately in the cert-manager logs, i got the error library “Your ACME client is too old”. In the library the is only the version v0.5.2. I have found a nice blog, that explains how to upgrade the cert-manager

if i open kubectl over the rancher gui and try "helm repo add jetstack https://charts.jetstack.io && helm update " i get the error: helm: comand not found

how can i use helm over the cli on Rancher2?