$ ETCD_VER=v3.5.0

$ GOOGLE_URL=https://storage.googleapis.com/etcd
$ GITHUB_URL=https://github.com/etcd-io/etcd/releases/download
$ DOWNLOAD_URL=${GOOGLE_URL}

$ curl -L ${DOWNLOAD_URL}/${ETCD_VER}/etcd-${ETCD_VER}-linux-amd64.tar.gz -o /tmp/etcd-${ETCD_VER}-linux-amd64.tar.gz
$ sudo tar xzvf /tmp/etcd-${ETCD_VER}-linux-amd64.tar.gz -C /usr/local/bin --strip-components=1

$ etcd --version
etcd Version: 3.5.0
Git SHA: 946a5a6f2
Go Version: go1.16.3
Go OS/Arch: linux/amd64

$ etcdctl version
etcdctl version: 3.5.0
API version: 3.5