Ensure that part1.rar and part2.rar are in the same folder and that their names haven't been altered.

The file was packed with an outdated compression algorithm or a newer RAR5 profile.

Because large high-quality audio or game assets often exceed file hosting limits, uploaders split them into sequential parts ( .part1.rar , .part2.rar , etc.) that must be fully downloaded and combined to access the underlying content. What Does the Filename Mean?