Purple assets and character doesn't collect in the demo

Dears,

Thanks for all your good work.
1) But kindly, I imported your Ultimate inventory system to different types of projects. But still your demo's assets show in purple color.
I tried different unity 3D projects (URP, HDRP).
I tried to change the renderer from the Edit menu/Rendering or from the Window menu/Rendering, but still purple.

2) When I run the demo scene, the player moves, collides with Pickup items, a letter "E" show up, but when I open the inventory window, it doesn't increase collected quantities.

I watched many long videos on your tutorial, but I am just using your Demo scene in a new empty project.
What am I missing?

Note: There are no errors in the console.

Best regards,
 
Another note:
The ground has normal colors (Green, brown...etc)
But the trees, building and the characters are still in purple color.
 
I tried just 3D project without URP or HDRP and now everything is working. (No purple color and when I press E the character collects the items).
But what about URP or HDRP, aren't they supported?
 
The demo scene requires the built in render pipeline. The asset will work with any render pipeline but the demo content uses the built in. @Sangemdoko will respond to number 2.
 
Thanks Justin.
I already solved the issue, and It works fine now.
1) Created a new project with the basic 3D core template, not the URP template.
2) Installed your inventory system.
3) And then, installed the URP
 
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