Since version 1.3 is quite old, more recent "Ultimate Edition" repacks (v2.2+) that include all expansions like Phantom Liberty are now widely available through groups like DODI Repack and FitGirl Repacks .
You need to open part01.rar using a program like WinRAR or 7-Zip ; it will automatically pull the necessary data from part03 and all other pieces to reconstruct the full files. Cyberpunk.2077.v1.3-CODEX.part03.rar
The file is one segment of a multi-part compressed archive containing version 1.3 of the game Cyberpunk 2077 , released by the scene group CODEX around August 2021. Since version 1
This specific release includes the 1.3 patch , which introduced the first free DLCs and various performance fixes. Since version 1.3 is quite old