The options are Choose a Different Catalog or Crete a New Catalog. I can not do either. I have a couple days old backup of the catalog on a networked drive, But I do know why the current catalog is not available, nor is there a way to Create a New Catalog or recover a backup from another drive.
What should I do?
As background, I have LR6, I did a LR CC trial, it expired, I reset to the license I purchased...then 2 days later this situation.