If the journal does open and looks good enough after dismissing the dialogs, you can probably re-save the journal from JMP 14 to get a cleaned up version without the JMP 16 additions.
Many versions ago, JMP N-1 could crash when reading JMP N journals. The dialogs are from the part of JMP that reads journals and notices something in the journal file that was invented for JMP N; the reader code in JMP N-1 is clever enough to skip past it without understanding it. I don't know what "MinInitInt" represents; maybe some sort of formatting or some minimum value for a control. JMP 14 won't miss it since JMP 14 doesn't know about it, but it is possible the journal will be missing some behavior you'd expect in JMP 16. The dialogs are letting you know. Sometimes a big chunk of the journal can be left out when this happens.
As @Mark_Bailey says, the journal is a text file that can be opened in an editor and looks a little bit like a JSL script. JMP does not support users editing or writing their own journals. The journal's language is not documented and intended only for saving/loading journals. Occasionally it is useful to peer into a journal, maybe to repair something. Never a fun thing to be doing.
Craige