FreeNAS® 8.3.1 can be downloaded from here. FreeNAS® is available for 32-bit (x86) and 64-bit (x64) architectures. You should download the architecture type that matches your CPU's capabilities.
The download page contains the following types of files:
- GUI_upgrade.xz: this is a compressed firmware upgrade image and requires a previous installation of FreeNAS® 8.x. If your intent is to upgrade FreeNAS®, download the correct .xz file for your architecture and see the section on Upgrading FreeNAS®.
- .img.xz or .img.txz: this is a compressed image that needs to be written to a USB or compact flash device. The section on Burning an IMG File describes how to write the image. The format changed in 8.2.0-BETA3 from xz to txz. This means that you should download the .txz version if you are upgrading from 8.2.0-BETA3 or higher. If you are upgrading from any version prior to 8.2.0-BETA3, use the .xz file.
- iso: this is a bootable image that can be written to CDROM. Installing from the CDROM is described in more detail in the Installing from CDROM section.
The download directory also contains the Release Notes for that version of FreeNAS®. This file contains the changes introduced by that release, any known issues, and the SHA256 checksums of the files in the download directory. The command you use to verify the checksum varies by operating system:
- on a BSD system use the command sha256 name_of_file
- on a Linux system use the command sha256sum name_of_file
- on a Mac system use the command shasum -a 256 name_of_file