X-Ray for ArcCatalog - Extension does not appear

[TimHayes2021]

I have ArcGIS Desktop 10.8.1 with Excel 2016. I installed X-Ray for ArcCatalog. However, the extension does appear in Customize - Extensions. When I choose Customize - Add-in Manager, in this window is shown X-Ray for Geodatabases under My Add-Ins. Refer to screenshots included here. 

Not sure if I should try to use ArcGIS Desktop 10.7? I was told it will work in 10.8.1, but never tried it until now. I know the ESRI site says only up to 10.7. 

Anyone get X-Ray for Geodatabases to work in ArcGIS 10.8.1?

[curtvprice]

Comment from the X-Ray download page (ArcGIS Online) - 

The X-Ray add-in for ArcCatalog will not be certified on ArcGIS Catalog 10.8 -10.8.1. We do not intend to update or certify the addin for any future releases. (In saying that, there is nothing preventing the addin from working in 10.8 or 10.8.1 and some folks are using it successfully.)

Sounds like it is not supported, so if it doesn't work, you should probably try 10.7.

[DanPatterson · Accepted solution]

and before anyone asks, it isn't available for Pro

Related unclosed thread

X-Ray for ArcCatalog for Pro? - Esri Community