I’ve been getting the same error for some time when trying to update Filter Bar:
An error occurred while updating The Events Calendar: Filter Bar: Before you can receive product updates, you must first authenticate your Elegant Themes subscription. To do this, you need to enter both your Elegant Themes Username and your Elegant Themes API Key into the Updates Tab in your theme and plugin settings. To locate your API Key, log in to your Elegant Themes account and navigate to the Account > API Key page. Learn more here. If you still get this message, please make sure that your Username and API Key have been entered correctly
I have ensure my credentials are in place on the site, and EC Pro updated perfectly at the same time I got this error for Filter Bar. Please advise.