Retail copies of Build 350 no longer exist on official launchers. You must find a "scene release" from groups like RELOADED or RG Mechanics that pre-dates the Executives update. Look for files dated mid-2015. The total download size is roughly 65GB (smaller than the modern 110GB install).
Early PC builds often required specific Nvidia or AMD driver patches to prevent "Build 350" specific crashes. for legacy build errors or a list of modern 2026 features you might be missing on that version? "GTA 5 PC Mods Online" Patch 1.26 Online Bypass Script