What is a Data Transfer Cable? A Data Transfer Cable is a cable that allows you to quickly and conveniently migrate and transfer large files from an old computer to a new one. Where on the Cable Matters USB 3.0 Data Transfer Cable is the Product Key for Easy Computer Sync? The Easy Computer Sync Product Key is located on the bottom of the Cable Matters USB 3.0 Data Transfer Cable. Is the Product Key necessary for the Cable Matters USB 3.0 Data Transfer Cable to transfer files? No, the Product Key is only necessary if you plan to use the Easy Computer Sync software to transfer files. If you plan to use the PCLinq5 software to transfer files, then the code is not necessary. Easy Computer Sync is compatible with Windows XP, Vista**, 7, 8, 8.1, 10, and 11. PCLinq5 is compatible with Windows XP, Vista**, 7, 8, 8.1, 10, 11, and macOS. Is there an extra fee associated with the Product Key? No, the Easy Computer Sync Product Key is included with the Cable Matters USB 3.0 Data Transfer Cable. Why is my Mac not receiving files? The Library, System, and Users folders on Mac Computers don't accept data transferred from another computer. Only the Applications folder accepts data that is transferred from another computer. Please open (expand) the Applications folder before data transfer, otherwise, it could fail.