---
title: "Step 1. Download and untar the server installation package"
slug: "dpo-install-using-linux-download-and-untar-the-server-installation-package"
updated: 2026-10-27T19:53:14Z
published: 2026-10-27T19:53:14Z
canonical: "docs.onespan.com/dpo-install-using-linux-download-and-untar-the-server-installation-package"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.onespan.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Step 1. Download and untar the server installation package

1. Download the server installation package, nns3_server_package_*.tgz, into your server install directory.
2. Optional. The product contains a SHA‑256 checksum that allows you to verify that the downloaded package is complete, unaltered, and safe to use. To take advantage of this checksum feature, download the checksum file nns3_server_package_*.tgz.sha256sum.txt. Place the .tgz file and the .txt file into the same directory and calculate the hash for the package using the following command:

```bash
sha256sum -c nns3_server_package_*.tgz.sha256sum.txt
```

If the result shows “OK” then the file is valid.
3. Untar the package. For example, if your install directory is /opt:

```bash
cd /opt 
tar -zxvf nns3_server_package_*.tgz
```

Untarring creates a directory called mfas where the files are unpacked. Using the previous example command, the directory /opt/mfas is created. /opt/mfas is referred to as <NNL_HOME>.

You can see the contents of the tarball in [Server Tarball Contents](/dpoa/docs/s3suite94-server-install-file-1).