(I can help with corrupted archive repairs). Are you looking to install the game for multiplayer?
Ensure you have part01 through part04 (or however many parts exist) downloaded into a single folder. ICARUS.v1.2.32.106195.part04.rar
Files downloaded in this manner (especially from unofficial sources) can contain malware or unauthorized software modifications. It is strongly recommended to scan the resulting extracted folder with reputable anti-virus software before running any .exe files. (I can help with corrupted archive repairs)
...part04.rar indicates this is one file in a larger split archive (e.g., .part01 , .part02 , etc.). You must have all parts in the same folder to extract the content [1]. how to use it
Here is a useful breakdown of what this file is, how to use it, and key safety considerations: