: Use a tool like WinRAR or 7-Zip . Right-click on part01.rar and select "Extract Here." The software will automatically pull data from part05 and all other volumes to reconstruct the full game installer.
: If you only have part 05, the extraction will fail. You need to locate the source where you found this file and download the remaining parts of the set. GF081222-ERDE-1.07.0-ELA.part05.rar
: Likely refers to the "ElAmigos" repack version, which is a common source for these archived parts. : Use a tool like WinRAR or 7-Zip