Errors when importing the package

[Rossi112]

Hello,
it looks like the mesh renderers cannot be assigned. When I download the repo manually and open it in Unity, I get many errors like:
"A meta data file (.meta) exists but its asset 'Assets/bg/fields/Area001/Mesh/SM_C_001_Apartment_01.asset' can't be found. When moving or deleting files outside of Unity, please ensure that the corresponding .meta file is moved or deleted along with it."

In the respective mesh folder there are only the .asset.meta files and not the associated .asset files. These .asset.meta files are deleted when the repo loads.

Since I'm relatively new to Unity, I would appreciate any support.