Why won't my PDF to Book application not open?
If you are receiving an error messages when trying to open your PDF to Book application, please try the following to troubleshoot the issue.
Go to System Preferences, open safely, and allow the download.
Make sure your pdf to book application is in your applications folder on your mac. Also if his happens with an error message referring to java please also move this to your applications folder, once they are both in the same folder this should allow the pdf to book software to open.
If all of these still fail to work, please give us an emaill on firstname.lastname@example.org