1.Open a cmd with admin privileges

2.navigate to ManageEngine\SupportCenterPlus\pgsql\bin and enter the below command:

For example:

SupportCenterPlus\pgsql\bin>psql.exe -U scpadmin -p 65432 -h 127.0.0.1 supportcenter

3.Once done, you will be prompted for a password and the default password would be scp@123

Attachment included.