You say you bought MEP online, but exactly where from? From Magix or from another seller? Was the serial number in an email? if not, where did you find it?
Because there could be many reasons for the activation failure we really do need this additional information.
Yes mate i bought Amazon and i download online they send me a serial number and i try to active I follow all the steps and not working and thanks to o response mate
You should never post confidential data, like your email address and order or serial numbers to a public forum like this one. Hence i have edited your post above and removed the image of your order, since it also includes confidential information.
However, I see you actually ordered Vegas Movie Studio 17 so this is not the correct forum. Please read this pinned post.
One other thing to note: these are user to user forums so no-one here works for Magix and no-one can check anything of your order history etc.