Upgrade failure

Issue:

Upgrade fails with error - "Error occurred :: Irrevertable exception occurred"

Analysis:

Tried to start database manually, but it fails to start. Antivirus has been disabled/uninstalled.

Log Traces:

Aug 10, 2016 4:02:37 PM [com.adventnet.db.adapter.postgres.DefaultPostgresDBInitializer] [INFO] : Command to be executed [C:\ManageEngine\AnalyticsPlus\pgsql\bin\pg_ctl.exe, -w, -D, C:\ManageEngine\AnalyticsPlus\pgsql\data, -o, "-p33366", start]
Aug 10, 2016 4:02:37 PM [pglog] [INFO] : waiting for server to start....This program is blocked by group policy. For more information, contact your system administrator.
Aug 10, 2016 4:02:38 PM [pglog] [INFO] : stopped waiting

Solution:

Check for any anti virus policy which is blocking the database to start (If disabling anti virus is not possible).

Verify if there is a Group Policy to prevent exe files from running under the appdata folder.