I recently purchased a retail box FMP12 from the Apple Store only to learn after trying to use it that it is not compatible with MacOS13, so I bought and installed FMP16 instead. Now I have a useless opened FMP12. I uninstalled the FMP12. Is it OK for me to sell the opened FMP12? And in case I did registered it, is there a way to un-register it so a buyer can register it? Thanks.