Oh, I think I discovered what this problem is. @Soulast
When I try to download by clicking Code → Download Zip or I try to clone the repository without Git LFS, the assets are corrupted in the process.
Solution:
So, I generated a packed release with instructions: Release Project Elementus: V0.1a · lucoiso/UEProject_Elementus (github.com)
Sorry about this problem and thanks for the information. : )