The official CorePack group officially shut down and ceased operations years ago. Because of this timeline, any file explicitly named "Grand Theft Auto V-CorePack.zip" found on the internet today should be treated with extreme suspicion. 1. It is Likely Malware
Here is a deep dive into the phenomenon, how it works, and what to expect. What is Grand Theft Auto V-CorePack.zip?
Files downloaded from unofficial sources (torrent sites, file-sharing sites) can contain viruses, trojans, or crypto-miners. Always scan compressed files with reputable anti-virus software.
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This allowed the already compressed size to shrink even further.