This single file ( part04 ) cannot function on its own. You must have all other numbered parts (e.g., part01, part02, etc.) in the same folder to successfully extract the game.
The .rar extension indicates a compressed folder that requires software like WinRAR or 7-Zip to extract. Cyberpunk.2077.v1.6.GOG.part04.rar
This patch added content inspired by the Cyberpunk: Edgerunners anime, including new weapons, a transmog system (Wardrobe), and cross-progression. This single file ( part04 ) cannot function on its own
If you are manually patching from an older version, updates are often non-cumulative. You may need to install previous patches (like 1.5) before applying 1.6. including new weapons
To run version 1.6, the game requires at least 70 GB of SSD space and a 64-bit Windows 10 operating system.