Hello, i’m afraid you grabbed the 4.15.3 branch, check on the left, if you downloaded by .zip it also should be the name of the .zip of course.
The 4.16 branch will actually show 4.17 on splashscreen. I grabbed the source for build exactly when they isolated their 4.16 work to prepare it for release.
Also please note that you can’t package with 4.16 branch as it is right now.
I actually stopped playing with build in the middle of adding Hairworks to it, it would appears that it’s one of the preventing proper packaging. I need to remove HairWorks from build to check and see.
Would be cool to be able to package with GameWork on 4.16, would “only” need to update to current 4.16 to get it over with.