Instead of downloading a pre-made repack (which may contain malware), download the used by scene groups. Tools like PS3 ISO Tool or 3k3y ISO Maker allow you to compress your personal dump.
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There is no official PC version of , as it remains a PlayStation 3 exclusive . Any website claiming to offer a native "PC ISO" or "PC Repack" for the game is likely distributing malicious software or fake files. repack download killzone 3 pc iso