The Create Time Dimension Excel Add-in was created over a decade ago, when Microsoft launched the ability to add apps to the Office app store.
The capabilities of the app ecosystem were somewhat limited and a lot of the initially envisioned features were never technically possible to add to the add-in.
If you still want to create your own a date dimension table in Excel, just create a table with the columns and dates you need using standard Excel formulas.
Please note that as of now, the add-in will show the following when opening in the hosting app.
Go to the Add-ins and choose to remove the add-in from the locally available add-ins. The Add-in is no longer listed in the store.
Thanks to everyone who used it and found it mildly useful.
Extra special thanks to everyone who helped with the development and translations, much appreciated.