Hi Rick - if she has 2018 she can export is as an earlier version
make sure she selects a twbx format
If this posts assists in resolving the question, please mark it helpful or as the 'correct answer' if it resolves the question. This will help other users find the same answer/resolution. Thank you.
Thanks! I just checked with my coworker and she does have 2018. She told me she had 10.4. I will upgrade my version and that should fix this.
Glad to help out
you can always open a book created by an earlier version - it is just since actually 10.5 that you can save back to previous versions