Can't launch GTA 4 Complete edition : r/GTAIV

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For some reason I can't change my texture quality to high. I can only set it to low and medium. Is there a reason why? : r/GTAIV

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A new update for GTA IV: The Complete Edition on Steam has added the missing songs and radio stations back. People also report that their saves have been corrupted. : r/pcgaming

Has anyone 100%ed GTA IV Complete Edition recently? I need some help. Are all the 55 achievements obtainable? And how many achievements are online? : r/steamachievements

Grand Theft Auto IV - PC Split Screen Multiplayer [ GTA Connected ] - Script released! : r/nucleuscoop

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Grand Theft Auto IV: The Complete Edition

GTA IV download: How to download GTA 4 on PC, system requirements, and more