When I try to open Reggie’s Linear Regression.zip from Jupyter notebook’s downloads section,

this error appears:

When I try to open _Reggie’s_Linear_Regression.Skeleton.ipynb from Jupyter notebook’s downloads section,

this error appears:

When I try to open _Reggie’s_Linear_Regression.Solution.ipynb from Jupyter notebook’s downloads section,

this error appears:

So, my questions are:

1-) Why these error happen?

2-) How can I open Reggie’s Linear Project with Jupyter notebook?

Thanks in advance.