Hi there!
Thanks for getting in touch, and I’m so sorry you’ve run into trouble with our latest updates. We’ve become aware of issues relating to the 4.2 upgrade process a bit late in the game and are doing our best to provide information and fixes to our users as soon as they’re available–we’re incredibly grateful for your patience as we try to get things sorted here!
It sounds like you’ve got the right plugins set up here, so per the instructions on our pinned post, you should be able to address your issue by manually reverting back to The Events Calendar and Event Tickets version 4.1.4, then updating again in the proper order.
Please give it a try and let us know on the appropriate forum if you should have any other issues–we’re here to help! 🙂 Thanks again!