RUNNING IN MY DIARY (self-contained) ON MAC SIERRA (10.12)
Owing to the introduction of App Translocation with 10.12, there is a small work around needed. Once you have the unzipped your IMDiaryM folder into your desired location, open it and find the InMyDiarySC file (this is the actual program). You will need to temporarily drag this out of the folder (maybe to the desktop) and then drag it back in. Then when you double-click it the program should run without a problem. I think you will only need to do this when you first start using the program. Subsequent updates should be ok.
If you cannot run it because of the message about running programs from unknown publishers, you should right-click or Ctrl-click over InMyDiarySC and select Open. That should enable you to bypass the message.