Hi There!
Thanks for reaching out to us!
I’m sorry to hear that you experienced that issue. Let me help you with that.
Could you please share with us a screenshot of the checkout showing the empty red box?
I can see that you already have an Events Calendar PRO non-profit license in your account, so this might have been just a glitch.
You should be able to download the plugins by going to your downloads page > https://theeventscalendar.com/my-account/downloads/
Please let us know about it.
Thanks,
Victor