@TIG Thanks for helping me!
Have you actually installed FredoSpline ? - either from its RBZ or using the ExtensionStore³ dialog auto-install...
No, I guess I did not. Again, I thought it was part of the Freedocollection that I purchased.
I did not realize the "Collection submenu" would include separate paid extensions as well.
I think my mistake was assuming it was included in the bulk paid for collection.
Again, I have been very grateful and impressed by the communities desire to help people.