You should never post a serial number for software that you have purchased, either from us or anyone else. This is a public forum and the information posted here is visible to anyone on the internet.
I updated the post so you should be ok now but please keep this in mind in the future. The serial you have is correct, I checked it. You should not try to enter it manually, you should only ever copy and paste the serial. You will need to use the keyboard to paste the serial. To do this on a PC you use Ctrl+V on a Mac it is Cmd+V, just make sure that your cursor is in the first box of the activation fields.