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How to download Engine source by perforce?

There is no specific instructions to download Engine source by perforce, although some docs metion it.

The web used to introduce this content is unavailable now.

https://docs.unrealengine.com/en-US/ProgrammingAndScripting/ProgrammingWithCPP/DownloadingSourceCode/Perforce/Basics/index.html

AFAIK you need a custom licensing agreement with Epic to get the engine from Perforce.
Otherwise, you can obtain the source code via launcher (it’s optional there) or from GitHub :slight_smile:

Hi voiceofwolf, thanks for reaching out.

Moth_Doctor is correct, you need to be a licensee to get UE from Perforce. The docs still exist, but they are hidden unless your account is flagged as a licensee.