I do not remember, is a complete project or a unity package? I ask because I do not remember. however, if it is a unity package just create a new project (must be empty), and then import the package.
if it is a project just open the scene in the assets folder and click it, and you should import all alone. I hope I was useful
however, the errors that you said, there are because do not have Blender (a program to modelling) but I'm not sure
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