Select or "Extract to RRRDDD/" using software like WinRAR , 7-Zip , or The Unarchiver (for Mac).
You are likely missing part01.rar or part02.rar . The extraction must start from the first file. RRRDDD.part03.rar
One of the parts (possibly part 03) is corrupted and needs to be re-downloaded. Select or "Extract to RRRDDD/" using software like
The software will automatically pull data from part03.rar and the others to create the final file. Troubleshooting RRRDDD.part03.rar
If the archive is protected, you will need the specific password to "prepare" the document. Do you have the other parts of this archive , or