Ensure you have all parts (001 through 050) in the same folder. Use a utility like 7-Zip or WinRAR. Only open the file ending in .001 to begin the extraction.
One day, a user named Alex downloaded 001-050.7z.001. Alex saw the strange extension and realized this wasn't a standard file they could just double-click to open. They learned that this was a split archive. To see the treasure inside, Alex had to gather all fifty pieces into a single folder on their hard drive. 001-050.7z.001
What to do if one of the .