Hi Kevin. You can buy it retail in store (it comes on a USB key only), or online and download the ISO image, burn a DVD, or install from ISO image and buy an activation key from Microsoft's web site. I bought it retail, but installed from a downloaded ISO image because VMWare could not boot/install W10 from the USB key, only DVD, but used the retail product key. Obviously you need an Apple USB DVD SuperDrive, or an older mac with a DVD drive, or download image to a virtual DVD drive. Will post feedback when I've spent some more time with Anyrail. Noel