Have you imported the meshes or are you trying to move the assets into your own project?
Btw, made a short video which shows the two ways how you move the assets into your own project 
I copy/pasted the vegetation_pack folder into my projects /Content/ folder. I tried on my Third Person C++ Code project and on my Blank C++ Code project. Same result.
EDIT: I’ll try using the method from your video. Copy-paste /Textures, /Meshes and /Material.
EDIT2: It worked thank you!
@…
Dear sir; i found another thread posted by you with the title “Free grass meshes”.
My question is
Is it already included within package “Foliage Starter Kit”…!!? OR it is deffer somehow…?
Thanks again
Best Regards
No, the other thread is about an outdated grass package which isn’t so good -> it uses another type of foilage shader and is not so low poly
Awesome pack! Using it for my uni final year environment project, thanks for making it free, great for a student 
Thank you so much for
Really great package for something that is free , good job ! That is really generous , I am sure community will appreciate that
Thanks !
You Rock! Thanks!!!
Thankyou!!! God bless you!
Thank you very much, & thanks for the accompanying videos. Great work! 
With keyframeing the settings in the graphbar, I can simulate a storm, or a hurricane, or a earthquake or a ++++ endless list 
Can i consider putting in the game im making? of coarse you will be in the credits!
You can use those assets for your commercial and non-commercial projects
Okey, finally i went to the point it was time to test vegetations, so i followed your video, and it works perfectly!
Thanks again!
Seriously Thank you man !!
Hey! Thank you so much for the free foliage! I have been looking every where and all the nice ones aren’t free. Btw, can you make some pine trees?
is a fantastic, fantastic thing.
With that said, could I get some help? It’s a minor problem, but after I put stuff down – bushes, grass, all of it – and build the lighting, I get a little warning. The warning says that I need to rebuild the lighting, in spite of the fact I just did that. I never saw warning until I threw in some of your foliage, so I assume the two are related. Any idea what that means?
Yep, I will also create some pine trees
Could you probably post a separate thread, because in my case I dont get problem and it seems like one that cant be solved so easily 
where is the price filter box please? i cannot find it .