I emailed them and this is the response I got (no help):
Thanks for your email. Unfortunately we haven’t been able to verify your license. If you’ve already purchased Google Analytics by Yoast Premium, please send us your license key so we can verify it manually.
If you have not yet purchased the premium version of the plugin, which includes free support, and would like to do so, please refer to yoast.com.
If you are using our free plugin and have questions regarding Google Analytics by Yoast, we would refer you to the following 2 options:
?Check out our extensive Knowledge Base
?Visit the free forum
If, after checking the Knowledge Base and forum, you still believe you have a bug, you can file a bug report or request features for the Google Analytics by Yoast plugin in the following GitHub repository: https://github.com/Yoast/google-analytics-for-wordpress
Unfortunately, we are unable to provide individual support for our free plugins, but I hope these suggestions are helpful.
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Thanks and regards,
Nile