Good morning, I am not a technical resource, and thus my answers are more high level for guidance only. in the link above, this allows you to migrate from MySql to Postgres, as we dropped support for mysql in SonarQube a long time ago. the other links are the process once you are running, to upgrade through the various release versions., and again, you are a ways behind and this might get painful. My only other thought was, put aside your SQ 6.7 install, and set up a new SQ 9.7 install and scan projects. Yes you would lose history in part in the new set up, but (a) you would have this history if needed in the old instance and (b) you would not have to do essentially 3 upgrades - make sense?