Your license key may not work for 2 reasons:
1) Your license key is outdated.
If you purchased the add-in after October 8, 2014, you are entitled for a free upgrade. Please email us if you haven't received your updated key.
If you got the products before October 8, 2014, you can upgrade to the latest version for 50% off the new license price. Or you can download the version compatible with your license key.
2) You are trying to activate a different add-in or an obsolete version of your product.
Please make sure you download the latest version of the product that you purchased.