I replace the zip file with new versions as new engine versions come out, the actual zip you downloaded should say .2.1.
Regardless that change came in before 5.2 even released and should be in all versions. So on another note, are you sure you are on the correct engine version then?
You also should really be getting the github version on a source copy of the engine as the binaries are not going to work anyway and the github branch is always more up to date.