Epic Games installation failures are most commonly caused by a corrupted cache, insufficient permissions, low disk space, or a problematic install path. Fix in order: (1) Clear the webcache — press Windows+R, type %localappdata%, open EpicGamesLauncher → Saved, delete the webcache folder. (2) Right-click the launcher → Run as administrator. (3) Check free space on your install drive — games can require 20-100GB+. (4) Change your install location to a simple path like C:\Games (fixes IS-0003). (5) Disable VPN if getting MD-0011-1037. (6) Library → three dots → Manage → Verify to repair corrupted files. (7) Install Visual C++ Redistributables (fixes II-E1003). (8) Reinstall the launcher from store.epicgames.com/download.
