Yes, you can run Orbis Pro Trader on a tablet with Windows 8.1 as long as the operating system isn't Windows RT. The Pro Trader application is compatible with Windows operating systems only. To find more information about it, you can use the online form that allows you to request for additional details.
Access online form and leave the Orbis Trader Pro checked in the selection menu: http://www.orbisfn.com/learnMore.php?what=da