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: Because the files are so heavily compressed, "unpacking" them requires significant CPU power and time. Depending on your PC, it can take anywhere from 30 minutes to several hours.

Because repacks are highly compressed, your CPU has to do immense work to unpack the data. If you have an older processor or are installing onto a traditional Hard Disk Drive (HDD) rather than a Solid State Drive (SSD), the installation can take anywhere from 30 minutes to several hours. Is it safe to play GTA Online with a repack? grandtheftautovrepackrgmechanics verified

Crucial Safety Tips: How to Ensure You Have a Verified Version : Because the files are so heavily compressed,

Repacks are strictly designed for single-player offline mode. Attempting to connect to official Rockstar GTA Online servers with a modified or cracked executable will result in a permanent ban. If you want to play multiplayer, you must purchase the official game. If you have an older processor or are