Method 1
Note Although KB 2771431 states that you do not have to restart your computer in order to apply the hotfix, you must restart the SharePoint Server as part of the installation process after you apply this hotfix.
Method 2
domain group policy default applies a restriction on PowerShell to allsigned that cannot be overridden by the usual Set-ExecutionPolicy Unrestricted.
Changed the policy (Computer Configuration/Administrative Templates/Windows Components/Windows
PowerShell : Turn on Script Execution to Allow all scripts
Ran the prerequisite installer successfully.