Your purchase code was emailed to you when you first purchased this product. The purchase code was also recorded during installation. Your purchase code can be found in the file <AEM>/license/readme.txt file, where <AEM> is the folder where Advanced Engineering Mathematics for Maple is installed. For example, on Windows this would be one of the following locations:

C:\Program Files\Maple 13\toolbox\AEM\license

C:\Documents and Settings\<username>\maple\toolbox\AEM\license

Open the readme.txt file, and look for the line beginning

PurchaseCode=

Note: If you have the Maple 11 version of this product, follow the same instructions, but look in the Maple 11 folder instead.