> For the complete documentation index, see [llms.txt](https://cesium.gitbook.io/cesium-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://cesium.gitbook.io/cesium-docs/getting-started/install-the-launcher.md).

# Install the launcher

The Cesium Launcher is the only thing you install; it signs you in, downloads the client, and keeps it current.

The Cesium Launcher is the only thing you install; it signs you in, downloads the client, and keeps it current.

## Before you start

* A Cesium account with beta access. Get it from the Discord server at [cesiumclient.com/discord](https://discord.gg/3QBFFwbbH).
* Windows 10 or newer. The launcher is Windows only.

## Download and install

{% stepper %}
{% step %}
Sign in to your dashboard and open the Download page.
{% endstep %}

{% step %}
On the Cesium Launcher card, click Download for Windows. The current launcher is version 1.0.0.
{% endstep %}

{% step %}
Open the launcher and sign in with your Cesium account.
{% endstep %}
{% endstepper %}

The first time you load Cesium on a PC, that machine is registered to your account and the dashboard asks you to approve it. Read [Devices](/cesium-docs/account/devices.md) before you install on a second PC.

## What the launcher does after that

* It downloads the Cesium client for you. There is no separate client download.
* It updates the client on its own. When a new client version ships, the launcher fetches it the next time you open it, before the client starts.
* It shows you the state of the running game and the client once Cesium is loaded.

## If your antivirus complains

Programs that load code into another process are often flagged. Cesium builds are signed. See [Windows Defender or antivirus flagged the launcher](/cesium-docs/support/antivirus-flagged-launcher.md) for what to do.

## The old jar loader

Earlier versions of Cesium used a jar file (Cesium Loader 0.8, on Java 17). It is retired and cannot be downloaded. If you still have it, delete it and use the launcher.


---

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