The TurboTax Deluxe Tax Year 2021 is a standard license CD featuring tax preparation software from the trusted brand Turbotax. This product is designed for use on Microsoft Windows 8.1, Microsoft Windows 10, and Mac operating systems, with a minimum of 2 GB of RAM and 1 GB of hard drive space required. With a minimum processor speed of 66 MHz, this software is efficient and reliable for individual tax filing needs. The unit is in English and is suitable for one device.