Difficulty upgrade from version 3.4.1 to 4.5.2 - sonarqube

Hi I'm trying to upgrade Sonarqube from 3.4.1 to 4.5.2 but had some issues.
I ensured that the sonar.properties file and the wrapper.conf file were both the same and changed them accordingly on the newer version. To install it we simply moved 4.5.2 onto the server and changed the symlink, this worked until it tried to upgrade the database then it stated 'Upgrade is impossible'
After this we couldn't get Sonar to start again, so we rolled it back to a previous version..
So our current predicament is whether or not to create a new version of Sonar on the latest version or to slowly upgrade the old one but from 3.4.1 to 3.4.2 etc..
What would you suggest?
Thanks

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