Sorry, request seemed weird to me. Haven't heard of second-hand copies of FusionPro Desktop being resold before. Is that even legal? I guess it could be (although, I know you probably would need to contact PTI support to release the machine-specific registration). Not sure that I would sell a copy if I spent hundreds of dollars on it.
Anyway, if you are just looking to generate FusionPro Expression images, you don't need FusionPro Desktop. You should be able to do right in the FusionPro Expressions App. Do you have that, or is that what you are looking to buy?