Mistake at uploading a package

I’ve installed a package named “Structural design” and it appears when i click on the option “Manage packages”. However, when I click on “add-ons”(left side) I don’t find the installed package.
What can I do to fix this?
Thank you

Also, when I try to move the package “Structural Design” to the path where the rest of my packages are by default, I get an error message.

Make sure you are installing a version which is compatible with your Revit build. The latest version indicates that it is for 2023 and Dyanmo 2.13; which you are not utilizing yet.

Also I believe that these nodes may surface under the Revit section of the library, as they are somewhat internally developed (Tomaz Fudala is an Autodesk employee). Check the “extra” folder which comes with the package installation and see if there are more clues there.