Sorry for the confusion this caused you.
You couldn’t have purchased the Business upgrade without a valid current license. I’m guessing this is native functionality of WooCommerce (or the add-on we’re using if there is one).
I believe, in the end, you’ll be able to get the upgrade to an active Business license (what you’re wanting now if I’m understanding you correctly) for the same price if you just click that “upgrade to business” link again from https://theeventscalendar.com/license-keys/
Are you saying that link is no longer visible? Do you see any indication in your account that you have a Business license? Did your checkout or order confirmation email indicate you were purchasing a Business license?