Right-click only on 5DGUPNZ17B.part1.rar .
You cannot extract Part 1 alone. You must download every subsequent file in the sequence (e.g., .part2.rar , .part3.rar , etc.) into the same folder .
Every part must have the exact same prefix. If you renamed 5DGUPNZ17B.part1.rar to Game.part1.rar , you must rename all other parts to match.