Upgrade failed to _6_0_0_SP-9_9_0

Upgrade failed to _6_0_0_SP-9_9_0

Dear Team,
I am using version build 6008, downloaded https://www.manageengine.com/products/self-service-password/5311766/ManageEngine_ADSelfService_Plus_6_0_0_SP-9_9_0.ppm to upgrade. I got the message that the upgrade process was failed and uninstall completed. How to troubleshoot?