Hello! @Michael Hecker
Welcome to the LastPass Community.
We truly apologize for the problem with your CSV file; let's try to download directly from the browser extension instead of the advanced menu.
Please access your browser extension, go to the bottom right corner, click on “Account,” fix a problem yourself, and click on Export vault items.
Please let me know if you need additional help.
Greetings!
Verlaine | Customer Care
We are grateful to know your issue has been addressed, we truly apologize for the issue, we try our best to provide you with the best service possible. I will close this case for now. If you need any more assistance in the future, please feel free to submit another request or send us an email.