Ensure you have all files in the set (e.g., ...part01.rar through ...part11.rar or ...part12.rar , etc.) in the same folder.
Right-click only the first file ( ...part01.rar or just ...part1.rar ) and select "Extract Here." The software will automatically merge all parts and extract the final file(s). BPLAWOK5001080WRZ500.part11.rar
Use software like WinRAR , 7-Zip, or The Unarchiver to extract the files. Ensure you have all files in the set (e