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What does this offer?

The ReactOS Release Image offers you the possibility of either installing ReactOS on your machine, or trying ReactOS without the need for installation. Once you boot from this image, a menu allows you to select what you want to do. The Live environment allows you to explore ReactOS in a temporary environment that will be reset at restart, without the need of installation. It also offers you the possibility of installing ReactOS on your machine. Alternatively, choose the Setup environment (Text Mode) if you wish to quickly install ReactOS on your machine. You will be directed to the setup program, please follow the instructions given on the screen. Please note that ReactOS is still in alpha state and provides no guarantee of stability, of safety for your files, or that it will work at all on your hardware.

What do I do with this?

ReactOS Wiki is an ideal source of information, it will help you setup ReactOS in your desired environment. "Installing ReactOS" page should help you get started.

Additional downloads

Source code for ReactOS 0.4.16

ReactOS Torrent downloads via FOSS Torrents

Nightly builds

If you wish to download the bleeding edge versions of ReactOS, then nightly builds may just be your cup of tea. However, they do come with a catch; you're more likely to encounter regressions at the cost of new features. These are built on every commit made to the GitHub master branch and run through extensive tests on the Testman.