Autotune 2.0 was meant for CDrom release but was never printed. It is only available for download at their website, www.antarestech.com . Version 3.0 for PC should be shipping on CD in the next few months, and will be a free upgrade.

To download it, just go to their website, go to download, fill out the appropriate information (select Autotune, not Autotune 3) and download either the RTAS or DirectX version. Install it, and use your code from the Mac CD you have.