If you receive a message that your code is not valid, you may be entering your code into the wrong version of the software. To determine what version of the software you have, open the software. The version number will be at the top.
Version 3.4 (the current version as of this writing) requires a code that fits in four boxes. If you don't have version 2.5 or greater, download the latest version here.
If you can not locate your code, you may request it by entering your email address at the automatic code lookup