docs: expand Desktop releases FAQ for support and older installs

content/manuals/desktop/troubleshoot-and-support/faqs/releases.md

@@ -1,23 +1,91 @@
 ---
-description: Frequently asked Docker Desktop questions for all platforms
-keywords: desktop, mac, windows, faqs
+description: Answers to common questions about Docker Desktop release frequency,
+  supported versions, installing older versions, and download errors
+keywords: desktop, mac, windows, faqs, releases, support, install, 403, version,
+  older version, old version, previous version, downgrade
 title: FAQs on Docker Desktop releases
 linkTitle: Releases
 tags: [FAQ]
 ---
 
-### How frequent will new releases be?
+### How often will new releases be?
 
-New releases are available every week, unless there are critical fixes that need to be released sooner. 
+New releases are available every week, unless there are critical fixes that
+need to be released sooner.
 
-The **Automatically check for updates** setting in the **Software updates** tab is turned on by default. This means you receive notifications in the Docker menu and a notification badge on the Docker Desktop Dashboard when a new version is available. 
+The **Automatically check for updates** setting in the **Software updates**
+tab is turned on by default. This means you receive notifications in the
+Docker menu and a notification badge on the Docker Desktop Dashboard when a
+new version is available.
 
-You can also let Docker Desktop automatically download new updates in the background by selecting the **Always download updates** checkbox.
+On Mac and Windows, you can also let Docker Desktop automatically download
+new updates in the background by selecting the **Always download updates**
+checkbox.
 
-Sometimes new versions are rolled out gradually over a few days. Therefore, if you wait, it will turn up soon. Alternatively, you can select **Check for updates** in the Docker menu to get the latest version immediately.
+Sometimes new versions are rolled out gradually over a few days. Therefore,
+if you wait, it will turn up soon. Alternatively, you can select **Check for
+updates** in the Docker menu to get the latest version immediately.
 
 ### How do I ensure that all users in my organization are using the same version?
 
-This is managed through your IT administrator's endpoint management software. 
+This is managed through your IT administrator's endpoint management software.
 
+### Which Docker Desktop versions are supported?
 
+> [!IMPORTANT]
+>
+> Docker Desktop versions older than six months from the latest release aren't
+> available for download. Previous release notes are available in the
+> [documentation repository](https://github.com/docker/docs/tree/main/content/manuals/desktop/previous-versions).
+
+Docker Support covers:
+
+- Docker Business: Versions up to six months older than the latest version.
+  Fixes apply to the latest version only.
+- Docker Pro and Team: The latest version only.
+
+For details, see [Supported versions](/manuals/support/_index.md#supported-versions).
+
+Docker recommends running the latest Docker Desktop release. See the
+[release notes](/manuals/desktop/release-notes.md) for the latest version and
+download links.
+
+### How do I install an older version?
+
+Installers are limited to the
+[six-month download window](#which-docker-desktop-versions-are-supported).
+Choose a version that still includes **Download Docker Desktop** links in the
+[release notes](/manuals/desktop/release-notes.md).
+
+The install commands don't take a version number. Choose the version by
+downloading that release's installer, then run the install steps for your
+operating system.
+
+1. Open the [release notes](/manuals/desktop/release-notes.md).
+1. Go to the version you want. Under the version heading and date, look for
+   a **Download Docker Desktop** section with links for Windows, Mac, and
+   Linux.
+1. If that section is missing, Docker doesn't provide an installer for that
+   entry from the docs. Choose another version that includes **Download Docker
+   Desktop**.
+1. Download the installer for your platform.
+1. If a newer version of Docker Desktop is already installed,
+   [uninstall](/manuals/desktop/uninstall.md) it before installing the older
+   version.
+1. Install the version you downloaded:
+
+   - [Install Docker Desktop on Windows](/manuals/desktop/setup/install/windows-install.md)
+   - [Install Docker Desktop on Mac](/manuals/desktop/setup/install/mac-install.md)
+   - [Install Docker Desktop on Linux](/manuals/desktop/setup/install/linux/_index.md)
+
+### Why do I get a 403 download error?
+
+A `403 Forbidden` response means the installer for that build isn't available
+to download. This usually means the build is outside the
+[six-month download window](#which-docker-desktop-versions-are-supported).
+This applies on Windows, Mac, and Linux, whether you use a browser, a package
+manager, or another download tool. The failure happens when fetching the
+installer, not when running the install command.
+
+Download a version that includes a **Download Docker Desktop** section in the
+[release notes](/manuals/desktop/release-notes.md).