Steam and Epic allow you to pause/resume downloads. You don't have to download 100GB in one session.
A more balanced option that keeps the story intact but reduces file size through better compression techniques and lower-quality audio. Risks and Precautions Gta 5 Download Highly Compressed Media File For Pc
Both Steam and Epic Games allow you to download portions of the game. For GTA 5, you can start the download, pause, and resume over days. Use a download manager like with Steam to avoid corruption. Steam and Epic allow you to pause/resume downloads