Procedural mesh importing issue

HI every body,
I’m actually new to UE4 … but I faced a problem that I couldn’t find it’s answer elsewhere.

I downloaded the procedural blinds generator from this link:

And actually it’s a great file.
But when I migrated one of the blinds to my project … and dragged the blueprint into my project it showed up blank , I mean the pivot is there but no meshes, I found out that I had to reassign some meshe’s into the blueprint parameters, but this is only works for the top bar of it, the rest of the blind “the cutrain it self” I didn’t know how to make appear or where to add it …

I hope you can help.me with this one … thanks a lot