The Template Controller can currently only be installed via kustomize:
kubectl create ns kluctl-system
kustomize build "https://github.com/kluctl/template-controller/config/install?ref=v0.8.1" | kubectl apply -f-A Helm Chart for the controller is also available here. To install the controller via Helm, run:
$ helm repo add kluctl https://kluctl.github.io/charts
$ helm install template-controller kluctl/template-controller