: WinRAR is the classic choice, but 7-Zip is a free, open-source alternative that handles RAR files perfectly. macOS : Use The Unarchiver or Keka .
The 3D community is generally safe (Blender Market, Gumroad, ArtStation), but downloading "Free Blender RAR files" from forum spam links is risky. RAR files can contain malware, viruses, or scripts.
The artist saved the file using "Absolute Paths." If the artist saved the texture on their computer at C:/Users/Artist/Desktop/Project/Texture.jpg , your computer is trying to look for that specific path, which obviously doesn't exist on your machine.