IBuildInstallerPtr StartBuildInstallStageOnly ( IBuildManifestPtr CurrentManifest, IBuildManifestPtr InstallManifest, const [FString](API\Runtime\Core\Containers\FString) & InstallDirectory, FBuildPatchBoolManifestDelegate OnCompleteDelegate, bool bIsRepair, [TSet](API\Runtime\Core\Containers\TSet)< [FString](API\Runtime\Core\Containers\FString) > InstallTags )