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This guide will walk you through installing Cellm and getting it ready to use in Excel. The whole process takes about 10 minutes.

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Requirements

Before installing Cellm, you’ll need Windows 10 or higher, Excel 2010 or higher, and the .NET 9.0 Runtime on your computer.
  1. Open “Microsoft Store” on your computer and search for “Microsoft 365”
  2. Click “Install” and follow the install procedure. Requires a Microsoft 365 subscription.
  1. Go to https://dotnet.microsoft.com/en-us/download/dotnet/9.0.
  2. In the ”.NET Runtime” table, find the “Windows” row and “Installers” column and click on x64 to download the installer.
  3. Run the installer.

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Install

To install Cellm:
1

Download the installer

Go to the Github Release page and download the latest Cellm-AddIn-Release-x64.msi
2

Run the installer

Run the installer and follow the prompts.
If you want to use the more powerful hosted models right away, you can skip this step. The Hosted Models section shows you how.
To get started with local models, we recommend you try out the Gemma 3 4B model with quantized aware training. Gemma 3 4B is a wonderful little model that will run fine on your CPU, ensuring no data ever leaves your computer. And it’s free.
  1. Download and install Ollama. Ollama will start after the install and automatically run whenever you start up your computer.
  2. Open the Windows Terminal, type ollama pull gemma3:4b-it-qat and hit Enter.
  3. Open Excel and type =PROMPT("What model are you and who made you?"). The model will respond that is is Gemma 3 and made by Google.
MCP lets AI models use external tools like web browsers, file systems, CRM systems, and databases. To use MCP servers and tools, you may need to install:Node.js (to run Node.js-based MCP servers):
  1. Go to nodejs.org
  2. Download the LTS version installer for Windows
  3. Run the installer and follow the prompts
  4. Verify installation by opening Windows Terminal and typing node --version
uv (to run Python-based MCP servers):
  1. Open Windows Terminal
  2. Run: powershell -ExecutionPolicy ByPass -c "irm https://astral.sh/uv/install.ps1 | iex"
  3. Verify installation by typing uv --version
Playwright dependencies (for the built-in Internet Browser tool):
  1. After installing Node.js, open Windows Terminal
  2. Run: npx playwright install --with-deps
Node.js and uv are runtimes that let you run MCP servers on your computer. Playwright is a specific built-in tool for browser automation. HTTP-based MCP servers run remotely and don’t require any installations.

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Upgrade

When a new version of Cellm is released, simply repeat the installation steps above with the latest installer.

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Uninstall

If you ever need to remove Cellm from your computer:
1

Open Add or Remove programs

Search for “Add or remove programs” in the Windows start menu and open it.
2

Uninstall Cellm

Select “Cellm” from the list and click “Uninstall”.

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You’re all set!

Cellm is now installed and ready to use. Open Excel and look for the new Cellm tab in the ribbon menu. From there, you can start using AI in your spreadsheets.

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Next steps

Prompting

Learn how to use Cellm to automate repetitive tasks in Excel.

Function Calling

Learn how to use Excel as a low-code task orchestrator by enabling Cellm to access external tools and data.

Local Models

Learn how to run models on your own computer. No data ever leaves your machine. And it’s free.

Hosted Models

Learn how to bring your own API key (BOYK) and use models from Anthropic, OpenAI, and others.