The Unreal Engine Marketplace . Epic authenticates asset downloads through the launcher. If you buy assets, you’ll need the launcher anyway—or you can migrate to Fab (Epic’s new cross-platform store), which offers some CLI download options.
For the truly curious, you can manually extract direct download links using any HTTP debugger (Fiddler, Wireshark, or even Chrome DevTools).
Building from source allows you to exclude certain platforms (like iOS or Android support) that you don't need, saving tens of gigabytes.
You get the complete C++ source code. You can modify the engine itself. Cons: Extremely slow initial sync (100GB+). Requires command-line knowledge.
Did you know that once the Epic Launcher downloads Unreal Engine, it is just a folder of .exe and .dll files? You can literally copy that folder to a USB drive and run it on any Windows PC without installing the launcher again.
Building UE5 from source can take anywhere from 45 minutes to several hours depending on your CPU.
Official, automatically handles dependencies and updates. Cons: You still have the launcher files on your drive; it just lacks a visible window.
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