Hi @Nirmal_Jose  the problem was related to a wrong version of com.google.gson imported by com.day.cq.pre-upgrade-tasks which was causing PreUpgradeTasksMBean component be in a satisfied state instead of an active state. Thanks for your support.

Yes, I'm.

Hi @Nirmal_Jose, thank you for helping.Yes, I'm able to find the preupgrade component under /system/console/configMgr:  But once I try accessing PreUpgrade tasks via URL it gives me 404.