Hello,
I am posting this to inform any potential users that Carport 1.4 works perfectly with Windows 8.1. I am currently running the trial version of Carport on a Dell Venue 8 Pro Tablet, with VAG K-Can Commander 1.4. All functions (that work on the trial version) work, and can connect to diagnostics and read codes. Obviously I have not tried adaption (as it requires the paid version) but will test once I have purchased. To use with this particular tablet, you will need to purchase a micro-usb to usb adapter. Attached is a few pictures.