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I really need a 4.12.2 build

is there any way to get me a 4.12.2 build? It was the last build that did not break the Hal Archviz tool kit. This would be a great help to me until they update the tool kit…

Maybe through github and building from source?

As KorkuVeren says, you will need to compile source code via Github

https://github.com/EpicGames/UnrealEngine/tree/4.12.2-release

Cheers