Silent Installation Errors in UFT

While attempting to install Unified Functional Testing (UFT) version 12.00 silently (using command line statements) as indicated by built-in product’s installation guide (\UFT_Install_Guide.pdf), the commands return errors:

The installer has encountered an unexpected error installing this package. This may indicate a problem with this package.
The error code is 2711.

Another symptom is an error within the “InstallUtil.InstallLog” file:

An exception occurred during the Install phase.
System.ComponentModel.Win32Exception: The specified service already exists The Rollback phase of the installation is beginning.
See the contents of the log file for the C:\Program Files (x86)\HP\Unified Functional Testing\bin\HP.UFT.HelperService.exe assembly’s progress.
The file is located at C:\Program Files (x86)\HP\Unified Functional Testing\bin\HP.UFT.HelperService.InstallLog

The installation guide provided with installation files contains an error where old statements used with 11.5x version of UFT, no longer supported by version 12 (and later/higher) of same. Below are examples within original Install Guide of UFT 12.00 no longer supported by UFT 12.00 and later versions:

* UFT_Mandatory

* Test_Results_Viewer