# Upgrade FSO Agent

Applications Manager allows you to upgrade the **FSO (Full-stack Observability) Agent** directly from the Applications Manager console. Applications Manager will send the upgrade request to the FSO Agent. The agent will then download and apply the update automatically.

[![FSO Agent View Agents page in Applications Manager](https://cdn.manageengine.com/sites/meweb/images/applications_manager/help/viewing-fso-agents.png)](https://www.manageengine.com/sites/meweb/images/applications_manager/help/viewing-fso-agents.png)

Follow the steps below to upgrade the FSO Agent in Applications Manager:

- [Step 1: Download and extract the agent package](https://www.manageengine.com/products/applications_manager/help/upgrade-fso-agent.html#step1)
- [Step 2: Initiate the Agent Upgrade](https://www.manageengine.com/products/applications_manager/help/upgrade-fso-agent.html#step2)
- [Step 3: Verify the Upgrade](https://www.manageengine.com/products/applications_manager/help/upgrade-fso-agent.html#step3)

## Step 1: Download and extract the agent package

1. Navigate to the **Settings → FSO Agent → View Agents** page in Applications Manager.
2. In the **Actions** column corresponding to the agent you want to upgrade, click the **Upgrade** icon.
3. A prerequisite pop-up message will appear instructing you to download the latest agent package and place it in the Applications Manager-installed directory.
4. Download the latest **FSO Agent (*ApplicationsManager_FSO_Agent.zip*)** package from the [agent download page](https://www.manageengine.com/products/applications_manager/server-agent-installation.html).
5. Place the downloaded zip file in the *<Applications Manager Home>/working/resources* directory and extract the package.

[![Upgrade Agent prerequisite pop-up showing prerequisites and manual steps](https://cdn.manageengine.com/sites/meweb/images/applications_manager/help/fso-upgrade.png)](https://www.manageengine.com/sites/meweb/images/applications_manager/help/fso-upgrade.png)

## Step 2: Initiate the Agent Upgrade

The FSO agent upgrade can be performed using the following methods:

### Global upgrade

Allows you to upgrade the overall FSO agent, including servers, application logs (AppLogs), and Auto profiler, by clicking on the **FSO Upgrade** button located at the top right corner of the table, under **Settings → FSO Agent → View Agents** tab.

[![View Agents page with FSO Upgrade button highlighted for a global upgrade](https://cdn.manageengine.com/sites/meweb/images/applications_manager/help/fso-upgrade-global.png)](https://www.manageengine.com/sites/meweb/images/applications_manager/help/fso-upgrade-global.png)

1. Navigate to **Settings → FSO Agent**.
2. Click the **FSO Upgrade** button available at the top right corner of the table to initiate the agent upgrade process.
3. A confirmation message **“Agent upgrade action initiated”** will be displayed.

### Sub-agent upgrade

Allows you to upgrade the required sub-agent modules alone in the FSO agent. This can be performed by navigating to the **Sub-agents** option and clicking on **Upgrade** for the required modules to be updated. For server sub-agent upgrade, clicking on the **Upgrade** option located adjacent to the respective agent hosts will initiate the upgrade process.

[![Sub Agent Management panel showing sub-agent upgrade options for AppLogs and APMInsight](https://cdn.manageengine.com/sites/meweb/images/applications_manager/help/fso-upgrade-subagent.png)](https://www.manageengine.com/sites/meweb/images/applications_manager/help/fso-upgrade-subagent.png)

1. Click on the three dots of the respective server in the **Actions** column.
2. Click on the **Upgrade** button to initiate the sub-agent upgrade.

## Step 3: Verify the Upgrade

Once FSO agent upgrade is completed, verify whether the **Agent Version** displayed on the **View Agents** page matches the newly upgraded version.

**Note:**

- Refer to the [FSO Agent Release History page](https://www.manageengine.com/products/applications_manager/help/server-agents-legacy-download.html) to select the appropriate agent version for upgrade.
- Ensure that the latest agent package is downloaded and extracted in the correct directory before initiating the upgrade.
- The upgrade process may take a few minutes depending on the agent connectivity and system resources.
- The agent must be running and reachable from the Applications Manager server for the upgrade to complete successfully.