They are only useful to switch between editions via new License Switch. Enter the Enterprise or Pro for Workstations key into a Pro install to initiate the switch (needs a reboot to complete). Or for people manually dealing with KMS needing the matching gVLK.
There is only 1 sticky RS4 thread, this thread is for a build which was supposed to be RS4 but dropped due to a major bug(hence the word "demoted" in thread title).