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Hi @DJ
Thank you for the detailed information. I tested a supported method that does not require an add-in. You can use Data Validation with a list of sequential dates to create a drop-down in the required cells.
Step 1: Create the date source list
- Create a separate worksheet and name it
DateList. - Enter your first date in cell
A2. - Select the cell and drag the fill handle down to generate the required sequence of dates.
- Include enough dates to cover the period you expect users to select.
Step 2: Apply the drop-down to the column
- Return to the worksheet where dates need to be entered.
- Select the required cells, for example
B2:B500. - On the Data tab, select Data Validation.
- On the Settings tab, set Allow to List.
- In the Source box, select the date range created on the helper worksheet.
- Ensure that In-cell dropdown is enabled, and then select OK.
When you select one of the configured cells, a drop-down arrow should appear and allow you to choose a date from the list. Microsoft documents this Data Validation process for Excel on Windows, macOS, and the web.
Please note that this produces a scrollable list of dates rather than a pop-up monthly calendar. It is nevertheless a supported option that does not depend on an add-in.
Regarding the add-in you installed, could you provide its exact name, your Excel version? Also, please check whether it appears under Home > Add-ins or Insert > My Add-ins. This information will help determine why the add-in is not currently visible.