The gold standard. FitGirl’s GTA V repack is famous. Her "High Quality" version weighs in at 35GB (down from 105GB). It includes all DLCs, optional 4K videos, and multilingual audio packs. Warning: Installation on a low-end CPU can take 5+ hours.
Once installed, you have a ~70GB folder. To maintain "High Quality," go to Documents\Rockstar Games\GTA V\settings.xml and set: Gta V Highly Compressed Pc High Quality Download
The search for a smaller file size can lead you into dangerous territory. The internet is riddled with fake download buttons and malware disguised as game installers. Here are the risks you must navigate: The gold standard