I bought my MacBook pro from a friend as it had paralleled on it and he said it was a licensed version, when i checked it it said activated!! You offered me by mail shot this morning an upgrade to 12, which i took and it cost me £40+, now when I try to upgrade and enter the licence info, the number is invalid. So i now have an upgrade with no path or number, what are my options?? Please advise as i need to reinstall this urgently as my windows software is no inaccessible... Hoping you can help!!!!