Q: My serial is no longer valid, I´m copying and pasting the one you sent me originally and it says that it is invalid, It worked on the first install, Can you help?
A: Of course, Did you check that is the same serial that appears in your account? There will be always the updated information. If is the same serial, check that the email you are typing, is the same you used on the first install.
If is still not working, please open a support ticket with the serial number and a screenshot showing the error message