# Agent installation on Windows Server 2008 R2 ends prematurely because of an error

## Issue

> Agent installation (or update) on **Windows Server 2008 R2** failed with a **"Xopero ONE Backup\&Recovery Agent setup ended prematurely because of an error."** message.

<figure><img src="/files/tNWAnkkGBwLz9pIOqZlf" alt=""><figcaption></figcaption></figure>

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## Cause

Starting with version 1.9.6, **Xopero ONE** agent installation on **Windows Server 2008 R2** requires the **KB4457144** update. Without this update, the system lacks the necessary security components, causing the installation to fail.

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## Resolution

1. Visit the [Microsoft Update Catalog](https://www.catalog.update.microsoft.com/Search.aspx?q=KB4457144) and download the version of **KB4457144** that matches your processor architecture (x64 for most **Windows Server 2008 R2** environments).
2. Run the downloaded installer on the target machine.
3. Restart the system (a restart is **mandatory** after installing this update to ensure all system components are correctly updated).
4. After the system restarts, run the **Xopero ONE** agent installer again. The process should now complete successfully.

{% hint style="warning" %}
**Windows Server 2008 R2** is a legacy operating system. Ensure that all other critical and security updates from **Windows Update** are also installed to maintain the highest possible level of security and compatibility for your backups.
{% endhint %}


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