I have built editor from sources. When I’m trying to access to Marketplace editor ask me to install Unreal Engine Launcher (from Engine/Extras/UnrealEngineLauncher). During installation it fails with this message:
“An error occured while applying security settings. Users is not valid user or group. This could be a problem with the package, or problem connecting to a domain controller on the network. Check you network connection and click Retry, or Cancel to end install.”
I also tried to run this installer separately but it keep failing.