How to install Caesr on MacOS, Windows and Linux?

Last updated: October 30, 2025

This guide provides the steps to install and run the Caesr Desktop application, which is based on the AskUI Agent OS, on various operating systems.

1. Initial Setup and Account Creation

To begin, you must first create an account and verify your email.

  1. Sign Up: Navigate to the main application page and Sign Up at app.caesr.ai.

  2. Verify Mail: Check your inbox and click the verification link to activate your account.

2. Desktop Application Installation (Recommended)

The recommended method is to use the dedicated desktop installer for your operating system. The desktop application handles the installation of the underlying AskUI Agent OS.

macOS Installation

  1. On the app.caesr.ai page, click the Download button.

  2. If prompted, select the appropriate download for your macOS system:

    • Click ARM64 for Macs with Apple Silicon (M1, M2, M3 chips, etc.).

    • (Note: Intel Macs are not currently supported).

  3. Install the Desktop App: Locate the downloaded file (typically a .dmg file) and double-click it. Follow the on-screen instructions to drag the application icon to your Applications folder.

  4. Run and Give Permissions: Launch the Caesr Desktop app from your Applications folder. You will be prompted to grant necessary permissions (like screen recording or accessibility) for the application to interact with your desktop. Accept these prompts.

Windows Installation

  1. On the app.caesr.ai page, click the Download button.

  2. Install the Desktop App: Locate the downloaded file (typically a .exe file) and double-click it. Follow the on-screen instructions to drag the application icon to your Applications folder.

  1. Run and Give Permissions: Launch the Caesr Desktop app from your Applications folder. You will be prompted to grant necessary permissions (like screen recording or accessibility) for the application to interact with your desktop. Accept these prompts.

3. Alternative: Custom Installation via pip (Requires Agent OS)

This method is suitable for advanced users, for Linux systems, and requires AskUI Agent OS to be installed first.

Prerequisites: AskUI Agent OS

You must install the core AskUI Agent OS and its dependencies (which includes Python) before attempting the pip installation.

Install and Run the Chat Server

Once the AskUI Agent OS is installed and running:

  1. Install the Chat Package: Open your terminal (or command prompt) and run:

    pip install "askui[chat]"

  2. Start the Chat Server: Start the local chat server using this command:

    python -m askui.chat

Important Note

  • Web App Access: The Caesr web application is not accessible via a mobile view. Please use a desktop web browser.

4. Silent Installation

Windows Installation

  1. Download the latest installer from Step 2: Desktop Application Installation -> Window Installation

  2. Open a Terminal

  3. Navigate to the downlaod folder via cd

  4. Enter caesr-v<version>-amd64.exe /S --force-run . Note: Replace <version> by your current version

    1. /S: Parameter for silent installation without an UI

    2. --force-run: Enforce the installation.