Hi Michael,
Thank you for posting your query. My name is Clarence, I'll be more than happy to assist you with your concern.
To resolve your query kindly do the steps below.
This object library does not work in the 64 bit version of Office and is no longer included with Office. It would make more sense to abandon it and use a VBA date picker. Personally I rather like Trevor Eyre's version - https://trevoreyre.com/portfolio/excel-datepicker - which can be modified to work in Word also with little effort.
Go to this link for your reference https://answers.microsoft.com/en-us/msoffice/forum/all/date-picker-in-excel-not-working/babdc495-25aa-482a-b424-64c53a666a62
Do not hesitate to message us if you need further assistance.
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Best Regards,
Clarence