The source code isn't public on github, you have to create an epic games account and link it. Steps are here [0]. There's 277,925 files and 22,000 directories.

The source code isn't public on github, you have to create an epic games account and link it. Steps are here [0]. There's 277,925 files and 22,000 directories. Installed from the community maintained builds linked from the documentation for windows. [0] https://www.unrealengine.com/en-US/ue4-on-github https://www.unrealengine.com/en-US/ue4-on-github