One of the parts was corrupted during the download process. You will need to identify which part failed and redownload it.
You do not have all parts in the same folder, or a part is named incorrectly. Ensure they strictly follow a matching sequence (e.g., part1.rar , part2.rar ). Prokofiev_Suites.part2.rar
You must have every single part (e.g., part1.rar , part2.rar , part3.rar ) downloaded and sitting in the exact same folder on your computer. One of the parts was corrupted during the download process
Navigate to the folder containing all your downloaded parts. Prokofiev_Suites.part2.rar
Right-click on (do not click part 2).