Un01.part1.rar -

The software will automatically detect and pull data from the other parts to reconstruct the original file.

Do you have of the archive downloaded in one folder? un01.part1.rar

Handling a file with a .part1.rar extension indicates that it is the first segment of a multi-part compressed archive. To access the contents, you must have all subsequent parts (e.g., .part2.rar , .part3.rar ) in the same location. How to Extract Multi-Part RAR Files The software will automatically detect and pull data

: You are missing one of the numbered parts. Check your downloads to ensure they are all present and named identically except for the part number. un01.part1.rar

: One of the parts may have been corrupted during download. You may need to re-download that specific part.