Is it only me who is annoyed by the semantic f… that Epic Games is making?
Storing the build on Github does not make the Engine free and open source.
¹. you have the source file for installing the engine. :)
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Full source code is also available at https://github.com/EpicGames/UnrealEngine but they require you to link a Epic Games account with a Github account and agree to their EULA to access it. See this and this document for the full procedure.