Thank you again! I'll look into it.
I've never build UE from source though, so.... i think i'll be able to do it :).
Yep! There are instructions here: https://docs.unrealengine.com/en-US/Programming/Development/BuildingUnrealEngine...
check the preq page linked at the top (downloading unreal engine from source) - only difference will be the repo to get.
Also recommend using VS2019