# Step 4: Installing and Testing a Marketplace App

Source: https://marketplace.gohighlevel.com/docs/oauth/TestingApp

This section explains how to generate a **Test Link** for a specific app version in the **Developer Marketplace** and use it to **install the app into a specific location/agency account** for testing.

## Prerequisites
Before you start, make sure you have:
- Access to the **Sandbox HighLevel account**
- Access to the **Developer Marketplace Account**

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## Steps

1. **Log in** to the **Sandbox account** and the **Developer Marketplace Account**.
2. Go to **My Apps** and click the **app** you want to test.
3. From the left-hand navigation, click **Manage**.
4. Click **Versions**.
5. Find the version you want to test and click the **three dots (⋯)** menu.
6. Click **Test Link** and provide the **Location ID** of the account where you want to install and test the app.
7. **Copy** the install link that is generated.
8. Open a **new browser tab** and paste the install link.
9. Click the **Install** button you see in the app details section.
10. Complete the installation and proceed with testing the app.

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## Output / Expected Result
- The app version is installed into the **Location ID** you provided.
- You can now proceed with functional testing (OAuth, API calls, webhooks, custom workflow actions & triggers, custom page, etc.).