What we’ll do:

1. Install Node.js (this automatically gives you npm and npx).

2. Double‑check everything is working.

3. Install GoMarble DXT

Step 1 – Open PowerShell

1. Click the Start button (Windows logo, bottom‑left corner).

2. Type powershell.

3. In the list that appears, right‑click “Windows PowerShell” → Run as administrator.
   A pop‑up will ask “Do you want to allow this app…?” Click Yes.

Step 2 – Install Node.js (Includes npm & npx)

In the blue PowerShell window, copy‑and‑paste this line and press Enter:

winget install -e --id OpenJS.NodeJS.LTS

When you see License terms? (Y/N), type Y and press Enter.
Winget now downloads and installs everything for you.

Step 3 – Restart PowerShell

Close the blue window, then repeat Step 1 to open a fresh PowerShell window.
(This refreshes Windows so it can find the new programs.)

Step 4 – Use the Commands to Verify Setup

Copy the first command below, press Enter, wait for the version number, then copy the second command and press Enter.

npm.cmd -v   # shows the npm version

(you should see a version number like 10.5.0)

npx.cmd -v   # shows the npx version

(you should see the same version number again)

If you get two separate version numbers—one after each command—everything’s working!

Step 5 – Open Claude Desktop Extensions Menu

1. In Claude, click the ☰ menu (top‑left) ➜ Settings → Extensions.

2. Click Advanced Settings.

3. Under Built‑in Tools, confirm a Node.js version is listed—this should match what you installed.

Step 6 – Turn Off Claude’s Built‑in Node

1. Still in Advanced Settings, find Use Built‑In Node.js for MCP.

2. Toggle this switch Off.

Step 7 – Install the GoMarble Extension (DXT)

1. Scroll to the bottom and click Install Extension.

2. Browse to where you saved the GoMarble.dxt file and select it.

3. Wait until Claude shows “Installed”.

Step 8 – Add Your GoMarble API Key

1. In Extensions, click the new GoMarble entry.

2. Paste your API Key into the field provided and click Save.

Step 9 – Enable the Extension

Toggle Enable next to GoMarble so it turns blue (On).

Step 10 – Restart Claude

Close and reopen Claude—or click Restart Claude if the button appears. Your GoMarble extension now uses the freshly installed Node.js!