Which addendum, 1 or 2?

1

The ActiveX control was removed.
You just need to remove the reference if you're using an existing template or made it when the original control existed.
If you started from refresh, just use a textbox.

Thanks Alex.  I'm still confused, I'm trying to do the the Calendar In the Calendar Seminar.  Because ActiveX is no longer there but the Date Picker is now part of the Date Field.  Then I don't need the ActiveX Datepicker to continue with the development of the Calendar.  Is that correct?

Did you view / review the Addendum videos?  Those explain the changes
Calendar Seminar Lessons

"Then I don't need the ActiveX Datepicker to continue with the development of the Calendar.  Is that correct?"

That is correct.