Hi Nan, You will have to contact Duxbury direct for a firm answer. (Orders@xxxxxxxxxx) It will depend on what version you have at the moment, and how old it is. Provided you are the sole user, then you may have a single-user license on your desk top and lap-top. George. From: duxuser-bounce@xxxxxxxxxxxxx [mailto:duxuser-bounce@xxxxxxxxxxxxx] On Behalf Of NanMillsmi@xxxxxxx Sent: 28 June 2008 20:23 To: duxuser@xxxxxxxxxxxxx Subject: [duxuser] Re: DBR WIN 10.7 enhances Math support My license number is G1835-12109651. How much will the upgrade cost me? I would like to upgrade. I use a desktop and when I travel I use my laptop. I would need to have access in both locations on the single user license. ________________________________ Gas prices getting you down? Search AOL Autos for fuel-efficient used cars <http://autos.aol.com/used?ncid=aolaut00050000000007> .