I saw the install log and i see the error below
11/27/18 12:32 PM (ExecTask) Copying 1 file to C:\niku_15_3\Clarity\bin
11/27/18 12:32 PM (ExecTask) Copying 1 file to C:\niku_15_3\Clarity\bin
11/27/18 12:32 PM (ExecTask) C:\niku_15_3\Clarity\.setup\scripts\readsvc.js(9, 1) WshShell.RegRead: Invalid root in registry key "HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MSSQL\DisplayName".
11/27/18 12:32 PM (ExecTask) C:\niku_15_3\Clarity\.setup\scripts\readsvc.js(9, 1) WshShell.RegRead: Invalid root in registry key "HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MSSQLSERVER\DisplayName".
11/27/18 12:32 PM (ExecTask)
11/27/18 12:32 PM (ExecTask) Failure occured:
11/27/18 12:32 PM (ExecTask) C:\niku_15_3\Clarity\.setup\scripts\deploy.xml:108: Could not discover local SQL Server service. Please ensure MS SQL Server is installed correctly on this machine.
11/27/18 12:32 PM (ExecTask)
11/27/18 12:32 PM (ExecTask) See admin.log file for possible errors, or try -verbose option.
11/27/18 12:32 PM (UnknownElement) Task "exec" finished with error.
C:\CA_15_3_InsMedia\InstallMedia\Install\install-packages\15.3.0\install.xml:607: exec returned: 1
This indicated that database server has some issue and hence it failed, were your 15.2 was up and running prior to upgrade?
Regards
Suman Pramanik