Ensure you have the complete set from the source. If the game is 6GB and parts are 2GB each, you need all three parts.
ApunKaGames is a "warez" or piracy site. Downloading from these sources carries risks of malware. It is always recommended to purchase the game through official storefronts like Steam or GOG to ensure you receive a clean, updated, and legal copy. download-singularity-apun-kagames-part2-rar
Large games are often split into smaller "parts" (e.g., Part 1, Part 2, Part 3) to make downloading easier and to stay within file size limits of hosting servers. Ensure you have the complete set from the source