Helm command not working for webhook server installation

[SejalParmar8796]

Hi,
I have installed the arc using command :
kubectl create -f https://github.com/actions-runner-controller/actions-runner-controller/releases/download/v0.20.2/actions-runner-controller.yaml
After that I am trying to create webhook server using helm command :
helm upgrade --install --namespace actions-runner-system --create-namespace --wait actions-runner-controller actions-runner-controller/actions-runner-controller --set "githubWebhookServer.enabled=true,service.type=NodePort,githubWebhookServer.service.type=LoadBalancer"

This helm command is giving error : Error: failed to download "actions-runner-controller/actions-runner-controller"

Also wanted to make a note that it was working earlier almost one and half month back. Can someone please help me to sort this out?