The reason for this is that version 4.2 contains some extra functionality that is not yet available in 5.0, and it is intended for people that want to stay on the Windows platform for several years to come.
If you are running 4.1, you can go ahead and install the CCM 5.0(4) and perform the upgrade as outlined at
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...