I have photoshop elements for my windows computer. I recently bought a mac, can I use the same program or do I have to buy new?
The same program cannot be used because there are different versions for Windows versus Mac. But you might be able to use the same license - it can depend on which version you have. Older versions allow the same serial number to be used on either platform, while newer purchases are usually for one platform only unless you specifically purchase a multi-platform license.