Meye1474,
I have never seen that issue. I'm assuming JMP is not detecting Office being installed. Per JMP System Requirements page, you will need Office 2010, 2013 or 2016. We have done some testing with the newer version of Office and it appears to work correct.
If you have one of the above versions of Office, my recommendation is to first do a reboot. It is possible you got an Office Update that needs a reboot. After doing a reboot, you will need to do a repair to reinstall the Excel Add-In for JMP since it was not available the first time.
With JMP closed, navigate to Control Panel > Programs & Features.
Find JMP 14 in the installed programs list. Right-click it and select Modify/Change.
This will open the installation options box. Find the Excel Add-In, if it is checked, you will need to uncheck it, click OK and follow the process. Reboot and do the above again, checking it this time.
If it is unchecked, check it and follow the process laid out above.
If that does not work, please try to do a repair on Office. You can see how to do that on this Microsoft Support page.
After repairing Office and rebooting, please follow the steps to add the Excel Add-In for JMP.
If that does not work, please enter a JMP support track in. You can do that HERE.