Hi there goodlooknout,
I’m sorry that the key is giving your trouble. Have you confirmed that the license key is still valid? You can check by logging into your account on tri.be and navigating to Account Central –> License Keys. All of your keys are listed there with the expiration dates. If your key is expired, you’ll need to renew before you have access to updates.
If the key is valid and you are still having trouble, it may be necessary for you to update manually. You marked that you are currently running The Events Calendar and Events Calendar PRO 2.0. Is that correct? You’ll want to update both plugins to 2.0.11 before making the big jump to 3.0. We have a guide on that update process here.
I hope the above will help out. If you need any more information or are still having trouble, don’t hesitate to let me know and we will troubleshoot further.
Cheers,
Leah