The exact or symptom you are seeing (e.g., crashing on launch, black screen)?

Look for reputable game download sites that offer the game in a highly compressed format. Some popular options include GameFab, GetGames, and others. Be sure to check the site's credibility and user reviews.

If the download is in ISO format, you may need to mount it using software like Daemon Tools or simply extract it if it's provided in a folder structure.