Downloading .bin files from a random Google Drive or Mediafire link is a security risk. The GOG client verifies file hashes, guaranteeing a clean install.
Even on GOG, things can go wrong. Here are the three most common issues and fixes. Downloading
If you have the GOTY (Game of the Year) Edition on GOG, the language packs are often compressed. To get better loading times and performance in Brazilian Portuguese: Even on GOG, things can go wrong
GOG Galaxy (recommended method)
Offline installers (GOG website)