I just downloaded Couchbase 4.0 DP to give it a try. I’m running on MacOS 10.10. When I launch the Couchbase app, the first thing that appears is a version check:
A new version of Couchbase Server is available!
Couchbase Server 3.0.2 is now available - you have . Would you like to download it now?
Presumably 3.0.2 is not an upgrade from 4.0…