My understanding is that upgrading from a Beta version to a GA version is not a supported upgrade path. If you don’t mind starting from scratch with an empty cluster, the sledgehammer solution would be to completely uninstall the beta before installing 7.0.1.
I am also facing the same issue. I created a topic around it Couchbase Upgrade Issues from 7.0.0 to 7.0.1. We are using the Enterprise Edition of Couchbase server in our staging environment, and when I tried to upgrade it from 7.0.0 to 7.0.1. The web console doesn’t start. Please let me know what information is need from my side or where should I look for errors.