How to upgrade sonarqube to 8.9LTS from 7.9 & How to add license of sonarqube 7.9 to 8.9LTS

I downloaded sonarqube8.9LTS and when i tried to add postgresql-10 existing database to 8.9LTS . Sonarqube is not starting .when i commented database part in sonar.properties then the sonarqube is starting … I have a doubt that before integrating database to sonarqube should we have to add license to it …here i’m using the enterprise edition …i have a license for 7.9 … is there any other new license required for 8.9LTS or i can use the same license of 7.9 to it…

When you try starting SonarQube v8.9 LTS, what do the logs say?