Occurrence
Solution
Firstly, open ArcGIS Pro, then click Settings. Navigate to Add-In Manager, then click the Options tab. In here check you have to folder listed, and than the option select is "Load all Add-Ins without restrictions (least secure)" (Note ArcGIS Pro does not support new signing methods, so in 2024 you cannot digitially sign addins).
![](https://discoverkb.dataminesoftware.com/images/ArcGIS%20AddIn%20Manager.png)
Restart ArcGIS Pro. If it still doesn't load Discover, manually run the ArcGIS Pro Addin installer by double clicking on the file -
C:\Program Files\Datamine\DiscoverArcGIS\Datamine.Discover.ArcGISPro.AddIn.esriAddinX