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I upgraded to PRO just now and it keeps saying invalid

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Make sure the name you are entering is the same name you registered.

The usual cause though is mistyping numbers/letters, 1 & l, 2 & Z, 5 & S, 8 & B.

Try copying the key from your email and pasting it in to the registration box. (Just copy the whole thing and paste it into the first box).

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