Download 6.6 community version rpm
Run non-root install script
[arunkumar@node1-mad-hatter-testing-centos7 cb-non-package-installer]$ ./cb-non-package-installer --install --install-location ~/couchbase-home/ --package ~/couchbase-server-community-6.6.0-7899-centos7.x86_64.rpm
2020/07/28T18:05:11 ERROR: Could not get version from Package name couchbase-server-community-6.6.0-7899-centos7.x86_64.rpm
It does not say anywhere in the PRD if we should support community version. But the fix is simple and patch is up for review. Will leave fixVersion empty until it is decided to take this in.