Download button and flow (#5029)

* download flow

* footer

content/en/_index.md

@@ -108,6 +108,6 @@ description: Connect, secure, control, and observe services.
     <div id="buttons">
         <a title="Install Istio on Kubernetes today." class="btn" href="/docs/setup/getting-started/">GET STARTED</a>
         <a title="Dive deeper to understand what Istio is and how it works." class="btn" href="/docs/concepts/what-is-istio/">LEARN MORE</a>
-        <a title="Download the latest release." class="btn" href="{{< istio_release_url >}}">DOWNLOAD {{< istio_release_name >}}</a>
+        <a title="Download the latest release." class="btn" href="/docs/setup#downloading-the-release">DOWNLOAD {{< istio_release_name >}}</a>
     </div>
-</main>
+</main>

content/en/docs/setup/_index.md

@@ -32,8 +32,7 @@ At a high level, the basic flow is the same regardless of platform:
 
 ## Downloading the release
 
-Istio is installed in its own `istio-system` namespace and can manage
+Download the Istio release which includes installation files, samples and a command line utility.
-services from all other namespaces.
 
 1.  Go to the [Istio release]({{< istio_release_url >}}) page to
     download the installation file corresponding to your OS. On a macOS or
@@ -55,7 +54,7 @@ services from all other namespaces.
 
     - Installation YAML files for Kubernetes in `install/kubernetes`
     - Sample applications in `samples/`
-    - The [`istioctl`]((/docs/reference/commands/istioctl) client binary in the `bin/` directory. `istioctl` is
+    - The [`istioctl`](/docs/reference/commands/istioctl) client binary in the `bin/` directory. `istioctl` is
       used when manually injecting Envoy as a sidecar proxy.
 
 1.  Add the `istioctl` client to your path, on a macOS or
@@ -69,7 +68,8 @@ services from all other namespaces.
 
 ## Installing Istio
 
-Choose one of the following installation options, depending on your intended use:
+Istio is installed in its own `istio-system` namespace and can manage
+services from all other namespaces. Choose one of the following installation options, depending on your intended use:
 
 - [Demo installation](/docs/setup/install/kubernetes/):
    This option is ideal if you're new to Istio and just want to try it out.

content/en/docs/setup/install/kubernetes/index.md

@@ -29,13 +29,6 @@ requirements.
 
 1. [Download the Istio release](/docs/setup/#downloading-the-release).
 
-    {{< warning >}}
-    These quick-start instructions will not work with a downloaded [istio repository](https://github.com/istio/istio)
-    because the pregenerated yaml files, `istio-demo.yaml` and `istio-demo-auth.yaml`, are only available in
-    [release images](https://github.com/istio/istio/releases). If you want to work with the latest Istio codebase,
-    refer to the [developer wiki](https://github.com/istio/istio/wiki) for instructions.
-    {{< /warning >}}
-
 1. Perform any necessary [platform-specific setup](/docs/setup/platform-setup/).
 
 1. Check the [Requirements for Pods and Services](/docs/setup/additional-setup/requirements/).

layouts/partials/footer.html

@@ -8,7 +8,7 @@
         {{- end -}}
 
         {{- if not .Site.Data.args.archive_landing -}}
-            <a class="channel" title='{{ printf (i18n "download_desc") (strings.TrimSuffix ".0" .Site.Data.args.full_version) }}' href="{{- $release_url -}}" aria-label="Download Istio">
+            <a class="channel" title='{{ printf (i18n "download_desc") (strings.TrimSuffix ".0" .Site.Data.args.full_version) }}' href="/docs/setup#downloading-the-release" aria-label="Download Istio">
                 <span>download</span>
                 {{ partial "icon.html" "download" }}
             </a>